Achievers Computing for JHS
Basic 7
FOR
JUNIOR HIGH SCHOOLS
BASIC 7 - 9
E. H. MANTEY
Based on the updated curriculum for computing issued by National
Council for Curriculum and Assessment (NaCCA) of the Ghana
Education Service / Ministry of Education.
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© 2023 E. H. Mantey
All rights reserved. No part of this publication may be reproduced, stored in
any retrieval system or transmitted in any form or by any means, electronic,
mechanical, recording, or otherwise without prior permission of the author.
Contact us on:
Post Office Box 227
Asafo - Kumasi
Email: mantey100@gmail.com
Mobile:
0547 252 297
0244 804 456
0203 864 789
WhatsApp Line: 0547 252 297
Type setting and illustrations by E. H. Mantey
Cover design by E. H. Mantey
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ACKNOWLEDGEMENT
The author is grateful to the Almighty God for the direction and the strength
and enablement for this task to be accomplished.
My sincere thanks go to Rev. J. K. Bempong for his advice and spiritual support.
Am also grateful to Mr. Awuni Samuel for his directions and encouragement
and Mr. Richard Mensah Gyapong for reading through the script and making
the necessary corrections.
Finally, I wish to thank my parents and the entire Mantey family.
DEDICATION
This book is dedicated to my late Grand Father T. S. Danquah and My children
Eden Danquah Mantey and Jason Jude Mantey.
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CONTENT
BASIC 7
STRAND 1 : INTRODUCTION TO COMPUTING
SUB-STRAND 1 : Components of Computers And Computer Systems
1
SUB-STRAND 2 : Technology in the Community
.............53
SUB-STRAND 3 : Health and Safety in Using ICT Tools
.
STRAND 2 : PRODUCTIVITY SOFTWARE
SUB-STRAND 1 : Introduction to Word Processing
66
SUB-STRAND 2 : Introduction to Presentation
91
SUB-STRAND 3 : Introduction to Electronic Spreadsheet
STRAND 3 : COMMUNICATION NETWORK
SUB-STRAND 1 : Computer Networks
..............113
.
136
136
SUB-STRAND 2 : Internet and Social Media
.........153
SUB-STRAND 3 : Information Security
.
SUB-STRAND 4 : Web Technologies
61
.
.....164
71
STRAND 4 : COMPUTATIONAL THINKING
SUB-STRAND 1 : Introduction to Programming
.175
75
SUB-STRAND 2 : Algorithm
...183
SUB-STRAND 3 : Robotics
89
SUB-STRAND 4 : Artificial Intelligence
...........................192
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BASIC 8
STRAND 1 : INTRODUCTION TO COMPUTING
SUB-STRAND 1 : Components of Computers And Computer Systems
SUB-STRAND 2 : Technology in the Community
SUB-STRAND 3 : Health and Safety in Using ICT Tools
STRAND 2 : PRODUCTIVITY SOFTWARE
SUB-STRAND 1 : Introduction to Word Processing
SUB-STRAND 2 : Introduction to Presentation
.197
............215
.220
.224
238
SUB-STRAND 3 : Introduction to Desktop Publishing
SUB-STRAND 4 : Introduction to Electronic Spreadsheet
STRAND 3 : COMMUNICATION NETWORK
SUB-STRAND 1 : Computer Networks
...............262
278
SUB-STRAND 2 : Internet and Social Media
...289
SUB-STRAND 3 : Information Security
..298
SUB-STRAND 4 : Web Technologies
304
STRAND 4 : COMPUTATIONAL THINKING
SUB-STRAND 1 : Introduction to Programming
309
SUB-STRAND 2 : Algorithm
SUB-STRAND 3 : Robotics
320
SUB-STRAND 4 : Artificial Intelligence
...........................325
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BASIC 9
STR
SUB-STRAND 1 : Components of Computers And Computer Systems
SUB-STRAND 2 : Technology in the Community
..........344
SUB-STRAND 3 : Health and Safety in Using ICT Tools
.350
SUB-STRAND 1 : Introduction to Word Processing
SUB-STRAND 2 : Introduction to Presentation
SUB-STRAND 3 : Introduction to Desktop Publishing
SUB-STRAND 4 : Introduction to Electronic Spreadsheet
.............372
.
.
SUB-STRAND 1 : Computer Networks
SUB-STRAND 2 : Internet and Social Media
....395
SUB-STRAND 3 : Information Security
.398
SUB-STRAND 4 : Web Technologies
.
SUB-STRAND 1 : Introduction to Programming
.
....408
.... 408
SUB-STRAND 2 : Algorithm
...418
SUB-STRAND 3 : Robotics
..
SUB-STRAND 4 : Artificial Intelligence
...........................425
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STRAND 1
INTRODUCTION TO COMPUTING
SUB-STRAND 1
COMPONENTS OF COMPUTERS AND COMPUTER SYSTEMS
CONTENT STANDARD 1
PARTS OF A COMPUTER AND TECHNOLOGY TOOLS AND THEIR USES
Indicators
At the end of this content, learners will be able to:
Discuss the fourth generation
Describe the types of input devices of a computer and their uses
Describe the types of output devices of a computer and their uses
Describe Storage devices
SECOND AND THIRD GENERATIONS OF COMPUTERS
The history of computer development is often discussed with reference to the
different generations of computing devices. In computing, the word generation is
described as the stages of development in technology or innovation. There are five
generations of computers. These are:
First-generation
Second-generation
Third-generation
Fourth-generation
Fifth-generation
FIRST- GENERATION (VACUUM TUBES)
These were the computers made from 1940 - 1956. The
processor or (CPU) in these computers were made
of vacuum tubes. They were the size of an entire
room, over 5 meters high and very costly to
maintain.
Vacuum tube
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First generation computers relied on binary-coded language (language of 0s and 1s)
to perform operations and were able to solve only one problem at a time.
Examples: ENIAC, EDVAC, and UNIVAC.
First-generation computers occupying the entire room
Characteristics of First-Generation Computers
1. These computers were based on vacuum tube technology.
2. These were the fastest computing devices of their times.
3. They were very expensive to operate.
4. They used a large amount of electricity.
5. These computers were very large, and required a lot of space for installation.
6. Since thousands of vacuum tubes were used, they generated a large amount
of heat. Therefore, air conditioning was essential.
SECOND GENERATION COMPUTERS (TRANSISTORS)
These were the computers manufactured from 1956-1963. Second generation
computers used transistors, which were superior to vacuum tubes that was used in
first generation. A transistor is made up of semiconductor material like silicon.
Second generation of computers came about as a result of the introduction of a
major processing device called transistor. These second-generation computers are
more reliable and compact than the first generation of computers.
Since transistors are very small device, the physical size of computers was greatly
reduced. Computers became smaller, faster, cheaper, energy-efficient and more
reliable than their predecessors
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Transistor
Motherboard with Transistors
Characteristics or features of second-generation computers
1.
2.
3.
4.
5.
6.
7.
These machines were based on transistor technology.
They were smaller as compared to the first-generation computers.
They were more reliable and portable.
They generated less amount of heat
Second generation computers still required air conditioning.
The frequency of maintenance was less compared to first generation
The computational time of these computers was reduced from milliseconds
to microseconds.
THIRD GENERATION COMPUTERS (INTEGRATED CIRCUITS)
They were the computers made from 1964 to early 1970s. Third generation of
computers are also smaller and faster than the second generation of computers due
to the introduction of Integrated Circuits
made computers smaller, more reliable and more efficient. Integrated circuit consists
of a single chip (usually silicon) with many components such as transistors and
resistors fabricated on it. Integrated circuits replaced several individually wired
transistors.
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Motherboard with ICs
Integrated Circuits (IC)
Characteristics or features of Third Generation Computers
1.
2.
3.
4.
These computers were based on integrated circuit (IC) technology.
They were portable and more reliable than the second generation.
These devices consumed less power and generated less heat.
The size of these computers was smaller as compared to previous
computers.
5. The maintenance cost was quite low.
6. They were able to reduce computational time from microseconds to
nanoseconds.
Differences between Second and Third Generation Computers
Second generation computer
Third generation computer
1. Second generation were based on
transistors.
Third generation were based on
integrated circuits (IC)
2. Second generation computers were
costly
Third generation computers cost less
compared to second generation
3. They were slower and less reliable
compared to third generation computer
They were faster and more reliable
4. They were bigger in size compared to
third generation computer
They were smaller in size due to the
introduction of integrated circuits
5. They produce a lot of heat and therefor
require air condition always
They produced less amount of heat and
may not require air condition.
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FOURTH GENERATION COMPUTERS (EARLY 1970 1980)
The fourth generation is an extension of third generation technology. Computers of
fourth generation used Very Large Scale Integrated (VLSI) circuits having about 5000
transistors and circuit element with their associated circuit on a single chip. Fourth
generation computers became more powerful, compact, reliable, and affordable. As
a result, it gave rise to the personal computer (PC) revolution, which uses
microprocessors.
Examples of computers of fourth generation were
1.
2.
3.
4.
5.
Apple II
Altair 8800
CRAY-1.
CRY-X-MP
DPD 11
Microprocessor
Features or Characteristics of Fourth Generation Computers
Fourth generation computers are based on microprocessor.
These computers are very small.
Fourth generation computers are the cheapest among all the other generations.
They are portable and quite reliable.
These computers generate very small amount of heat; hence they do not require
air conditioning.
6. Production cost is very low.
7. Power consumption is very low.
1.
2.
3.
4.
5.
Microchip
A microchip is also known as an integrated circuit (IC).
Microchips are used in all electronic devices - from small
flash drives to complex computers and even some
motorized vehicles.
After the transistor was invented, subsequent technology
allowed for a reduction in size and the creation of complex
circuits that can be placed on a small piece of
semiconductive material, usually silicon, known as a chip.
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Processor
The processor, also called the central processing unit (CPU), interprets and carries
out the basic instructions that operate a computer. The processor significantly affects
overall computing powe
personal computer, all functions of the processor usually are on a single chip. Some
computer and chip manufacturers use the term microprocessor to refer to a personal
computer processor chip.
Processors contain a control unit and an arithmetic logic unit (ALU). These two
components work together to perform processing operations.
Control Unit: The control unit is the component of the processor that directs and
coordinates the operations in the computer.
Arithmetic Logic Unit: The arithmetic logic unit (ALU) is the component of the
processor that performs arithmetic and logical operations. Arithmetic operations
include basic calculations such as addition, subtraction, multiplication, and division.
Processor Architecture
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Advantages and disadvantages of microprocessor
Advantages of a processor
1. The microprocessor are general purpose electronics processing devices which
can be programmed to execute a number of tasks
2. High speed
3. Low power consumption
4. It is very reliable
5. Less heat generation
6. The microprocessor is very versatile
Disadvantages of a processor
1.
2.
3.
4.
5.
The overall cost is high
Overall product design requires more time
Most of the microprocessor does not support floating point operations
The processor has a limitation on the size of data
This processor should not contact with the other external devices
COMPONENTS OF THE MOTHERBOARD
Your computer cannot work without the motherboard. It ties everything together. It
allows every part of your computer to receive power and communicate with each
components are connected to. It is a thin plate that holds the CPU, memory,
connectors for hard drive and optical drives. The motherboard connects directly or
indirectly to every part of the computer.
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Main Components of the motherboard
Components
USES
CPU slot
The CPU slot or socket is a connector on the motherboard that
connects the CPU.
CPU Chip
Central Processing Unit chip is a processor that performs all
the tasks that take place inside the computer system
RAM slot
RAM slots are for attaching RAM. In desktop we can see two
slots of RAM but in server motherboard we can see 4 or more
slot of RAM. RAM comes in different size.
Basic Input-Output System is firmware that is used to perform
hardware initialization during the booting process. BIOS
provides basic input output functionality. BIOS control the
booting or startup process
The bus connects the CPU to various internal components.
BIOS
BUS
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PCI slot
Parallel port
CMOS
USB connector
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PCI stands for Peripheral Component Interface; PCI slot allows
you to insert expansion cards into your computer. PCI used to
connect additional PCI device like network cards, sound cards,
modems, video cards. Most computers today no longer come
with a PCI expansion slot.
Parallel port is used to connect and transfer data through
multiple communication channels in parallel.
CMOS (Complementary metal-oxide-semiconductor) is used
to store BIOS setting in computer motherboard. CMOS
Battery also store date and time of the computer.
USB is Universal serial bus. It is used to connect the PC to
other devices via the USB port such as mouse, keyboards,
scanners, cameras, and even printers.
Heat Sink
Heat sink a device that is designed with built-in fans to
cool down hot components such the CPU.
VGA Port
A Video Graphic Array (VGA) connector is a three row
15-pin connector. It is used to connect and send signals
between computers and monitors, and between
computers and televisions
Keyboard / mouse
connector
All computers have a keyboard or mouse connectors. They
are used to connect keyboard and mouse through the PS/2
connectors.
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INPUT DEVICE OF THE COMPUTER AND THEIR USES
INPUT DEVICES
Input device is any hardware component that allows you to send data and
instructions into a computer. Input devices take information obtained from outside
the computer system and send them into the computer. The widely used input
devices are the keyboard, mouse, microphone, scanner, digital camera, and webcam.
EXAMPLES OF COMMON INPUT DEVICES
Mouse
Touch screen / monitor
Digital camera
Barcode reader
Keyboard
Scanner
Signature pad
Touch pad
Fingerprint scanner
Microphone
Light pen
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MANUAL AND AUTOMATIC INPUT DEVICE
As discussed early, input device is hardware that allow data to be entered into a
computer. Input devices are usually grouped or categorized under manual or automatic.
Manual input devices
Manual input devices are input devices that are used by people to enter or sent data
into a computer by hand. They require human interaction all the time.
EXAMPLES OF MANUAL INPUT DEVICES
1.
2.
3.
4.
Mouse
Keyboard
Touchpad
Scanner
5. Digital Camera
6. Light pen
7. Microphone
8. Fingerprint Scanner
Automatic input devices
Automatic input device is an input device that allows data to be sent into the
computer with no or little human interaction. Data in captured and entered directly
into the computer without any human intervention. They are sometime referring to
as direct input device.
Examples of automatic input device
Magnetic Strip Card Reader
(MSCR)
Optical Mark Reader
(OMR)
Optical Character Reader
(OCR)
Chip and Pin Reader
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Differences between Manual and Automatic Input Device
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Manual Input Device
Automatic Input Device
Data is input into the computer by hand
Data is input into the commuter by a
device or machine
They require no or little human
interaction
They require human interaction.
USES OF INPUT DEVICES
MOUSE
The mouse is an input or pointing device used to select an item shown on the
computer screen. The mouse usually has two buttons and a small wheel.
TYPES OF MOUSE
The mouse comes in different varieties including;
Mechanical mouse
Optical or laser mouse
Wireless or cordless mouse
MECHANICAL MOUSE
Mechanical mouse has two buttons, that is left and right buttons, scroll button, cable
or cord and a hard robber ball that rolls as the mouse is moved. The ball controls the
movement of the cursor on the screen when rolling on a flat surface. Mechanical
mouse is placed on a mouse pad. Mouse Pad is a rectangular rubber or foam pad
that provides better traction than the top of a desk or table.)
Rolling ball
Mechanical mouse
OPTICAL MOUSE
Optical mouse has no ball or roller
but uses light emitting diodes
(LED) sensors in place of ball to
detect movement.
Optical mouse
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WIRELESS OR CORDLESS MOUSE
The wireless or cordless mouse uses either Infrared or Bluetooth technology to
communicate with the computer. They can either be mechanical or optical but
requires power in a form of batteries before the can
be use.
Wireless mouse
Uses of mouse
1.
2.
3.
4.
To select an item on the monitor.
To direct the movement of the cursor
To open or launch application or program.
For playing computer game
KEYBOARD
A computer keyboard is an input device that allows users to enter data into the
computer. It contains keys that you press to enter data into the computer. Keyboard
allows the user to issue commands into the computer.
Keyboard layouts also include QWERTY, Dvorak, AZERTY, QWERTZ, and DaVinci
concept, each keyboard layout suits different environments. The most common used
keyboard layout is the QWERTY and the Dvorak keyboards.
TYPES OF KEYBOARDS
There are various types of keyboards. They include;
Standard wired keyboards
wireless keyboards
Standard Wired Keyboard
Wired keyboard means there is a wire or cord connecting your keyboard to your
computer. At the end of the wire is a USB connector that goes into a USB port on
your computer or PS/2 plug that goes into the PS/2 connector on your computer.
Wired keyboards are extremely reliable and hence the most widely used keyboard.
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USB connector keyboard
PS/2 connector Keyboard
Wireless Keyboard
A wireless keyboard is a computer keyboard that
allows the user to communicate with computers
with the help of radio frequency (RF), such as WiWireless Keyboard
Fi, Bluetooth and infrared (IR) technology. They do
not require any cord or wired connection with the computer system.
Uses of Computer Keyboard
1. Keyboard is used to key in or type on the computer.
2. It is also used to issue command on the computer.
3. It can also be used to play computer game
DIGITAL CAMERA
A digital camera is an input device that captures photograph and stores the image in
a digital form or on a memory. Many digital cameras can also record videos with
sound.
Uses Digital Camera
1. To capture or take and store images digitally.
2. To record videos with sound.
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LIGHT PEN
It is a pen-liked instrument or device whose tip can be detected on the computer
monitor. It is used to draw or make selection by tapping. The stylus has the same
function as the mouse or touchpad. It is used on touchscreen devices such as
computers, mobile device, personal digital assistants (PDA), game consoles and
graphic tablet.
Uses of Light Pen
1. It is used in making screen selection same as the mouse
2. To draw object on the monitor or screen.
TOUCH SCREEN
A touch screen is a touch-sensitive display device. It is a display screen on which user
select options by touching the screen directly. Touchscreen enable the user to
interact directly with what is displayed on the screen rather than using mouse or
touchpad. Touch screen is an input device and at the same time an output device.
Uses of Touch Screen
1. It enables users to input or control data or information on the computer.
2. It allows user to interact directly with what is displayed on the screen
TOUCHPAD
Touchpad is mostly located on laptop computers. It is also an input device for
selecting items on the monitor.
Uses of Touchpad
1.
2. To control the movement of the cursor.
3. To open an application.
FINGERPRINT SCANNER OR READER
A fingerprint scanner is a type of biometric security technology that uses both
hardware and software techniques to identify the fingerprint scans of an individual.
Uses OF Fingerprint Scanner
1. To capture and store the fingerprints details of an individual
2. It is used to authenticate the fingerprint of an individual in order to grant them
access into a system.
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SIGNATURE PAD
on an LCD touchpad using a pen-liked stylus.
Uses of Signature Pad
1. Signing forms and other paperwork
2. For adding signature to ID cards
BARCODE READER
Barcode reader, also called a price scanner is a hand held or stationary input device
used to capture and read information contained in a bar code. It is a hardware input
device capable of reading a barcode and printing out the details of a product or log
information about that product into a database.
Uses of Barcode Reader
1. To capture information about a product into a database.
2. To read barcodes of products.
MICROPHONE
Microphone is a device that converts sound vibration in the air into electrical signals.
It used to send audio into the computer.
Uses of Microphone
1. It allows users to speak into the computer.
2. For recording sound at the music studio
3. It is also used with public address system to produce sound
SCANNER
A Scanner is an input device that converts documents (text and graphics) into an
electronic format that can be stored on a disk. A scanner converts printed material
(such as text and pictures) into a form the computer can use. The two most common
types of scanners are hand-held and flat-bed scanner.
Hand-held Scanner
Flat-bed scanner
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Uses of Scanner
1. To convert printed material into digital format.
2. To share hard copy photo with family and friends on the internet.
3. For copying of documents.
POINTING DEVICES
Pointing device is any device that is used to control the movement of the pointer or
cursor on the computer screen.
Examples include;
1.
2.
3.
4.
5.
Mouse
Trackball
Pointing stick
Joystick
Touchpad
Note
All pointing devices are input devices but not all input
devices are pointing device. For example, keyboard is
an input device but it is not a pointing device.
ADVANTAGES AND DISADVANTAGES OF INPUT DEVICES
KEYBOARD
Advantages of Keyboard
1. Enables fast entry of new text into a document.
2. Most people find them easy to use.
3. Easy to do verification check as data is entered, as it appears on the screen
simultaneously.
Disadvantages of Keyboard
1.
2.
3.
Users with limited arm/wrist use can find keyboards hard to use.
Entering data is slow when compared to direct data entry (e.g., OMR).
They use up desk space as they are quite large.
MOUSE
Advantages of Mouse
1.
Faster to select an option by a mouse than a keyboard.
2.
Enables easy navigation through applications and the internet.
3.
Disadvantages of Mouse
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1. People with restricted hand/wrist movement can find it hard to operate a mouse.
2. They are hard to use if there is no flat surface available
3. They are easily damage.
JOYSTICK
Advantages of Joystick
1.
Easier to navigate round a screen compared to a keyboard.
2.
Control is in three dimensions.
Disadvantages of Joystick
1. More difficult to control the on-screen pointer with a joystick than with
mouse.
TOUCHPAD
Advantages of Touchpad
1.
Faster to select an option by a touchpad than a keyboard
2.
Enables rapid navigation through applications and the internet
3.
They require no flat surface unlike a mouse.
Disadvantage of Touchpad
1.
People with limited hand/wrist movement can find touchpads hard to use
2.
It is difficult to control the pointer when compared to a mouse.
3.
Drag and drop operation is difficult when compared to a mouse.
WEBCAM
Advantages of Webcam
1.
Allow people to keep in contact with each other without the need to travel
2.
It is very useful in video and conference calling
Disadvantages of Webcam
1.
Webcams have limited features and often poor picture quality.
2.
They need to be connected to a computer.
DIGITAL CAMERA
Advantages of Digital Camera
1.
They produce better quality photographs than traditional cameras.
2.
Very easy to upload photographs to a computer.
3.
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Disadvantages of Digital Camera
1. The camera user needs to be computer literate to use the camera properly.
2. Images often need to be compressed to reduce the amount of memory used.
3. The resolution is not yet as good as traditional cameras.
SCANNER
Advantages of Scanner
1.
Images can be stored for editing at a later time
2.
It is possible to recover damaged documents and photographs by scanning
them again.
3.
Scanners are much faster and more accurate than typing the whole
documents again
Disadvantages of Scanner
1. The quality can be limited depending on how good the scanner resolution is.
MICROPHONE
Advantages of Microphone
1. Faster to input text than to type it using a keyboard
2. Possible to manipulate sound using special software
Disadvantages of Microphone
1. Voice typing is not accurate as typing in manually using keyboard.
2. Sound files use up a lot of memory space.
BARCODE READER
Advantages of Barcode Reader
1. Faster than manually keying information.
2. Barcodes enable automatic stock control.
Disadvantages of Barcode Reader
1. Barcode scanning is an expensive system to use. since every item in the shops
needs a barcode and every barcode needs to be entered on the system.
2. Barcode can be swapped around on items this can affect the price.
3. Also, there is a need to invest in the computer technology and staff training
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OUTPUT DEVICE OF THE COMPUTER AND THEIR USES
Output devices are device that displays information on the computer to user. Output
device is any piece of computer hardware equipment which converts information
from machine-readable into human-readable form. It can be text, graphics, audio,
and video. Common output device includes monitor, printer, projector, plotter,
speaker and headphone. Computer output that are tangible are called hardcopy, and
those that are not tangible are called softcopy.
EXAMPLES OF OUTPUT DEVICES
Printer
Projector
Monitor
Headphone
Speaker
Plotter
MONITOR
Monitor also called Visual Display Unit (VDU) is an output device or screen that
displays information on the computer to the user. The monitor is like the Television
screen. It displays the content of data processed by the computer to users. They are
available in screen sizes of 14, 15, 17, 19, 21, inches and so on.
Information display on the screen of the monitor is called Softcopy, while printed
materials are called Hardcopy. The two main type of monitor are Cathode-ray tube
(CRT) and light emitting diode (LED) monitors.
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CRT Monitor
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CRT monitor
LED monitor
A cathode-ray tube also known as CRTs monitor is a desktop monitor that contains a
cathode-ray tube. A cathode-ray tube is a device that uses a beam of electrons in
order to produce an image on a screen. CRT is a large, sealed glass tube. The front of
the tube is the screen. CRT monitors for desktop computers are available in various
sizes, with the more common being 15, 17, 19, 21, 22 and 24 inches. They are widely
used in a number of electrical devices such as computer screens and television sets.
How it works
Parts CRT monitor
In a cathode ray tube, the "cathode" is a heated filament. The heated filament is in a
vacuum created inside a glass tube. The ray is a stream of electrons generated by an
electron gun that naturally pour off a heated cathode into the vacuum. Electrons are
negative. The anode is positive, so it attracts the electrons pouring off the cathode.
This screen is coated with phosphor, an organic material that glows when struck by
the electron beam. As a result, the image, which we see on the screen, is the
combination of all the electron light emissions.
LED and LCD Monitors
A liquid crystal display (LCD) uses a liquid compound to present information on a
display device. Computer LCDs typically contain fluorescent tubes that emit light
waves toward the liquid-crystal cells. The quality of an LCD monitors or LCD screen
depends primarily on its resolution, response time, brightness, dot pitch, and
contrast ratio.
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Resolution is the number of horizontal and vertical pixels in a display device. For
example, a monitor that has a 1600 x 1200 resolution displays up to 1600 pixels per
horizontal row and 1200 pixels per vertical row. A higher resolution uses a greater
number of pixels and thus provides a smoother, sharper, and clearer image.
Pixel refers to the dots that make up the image.
Dot pitch sometimes called pixel pitch, is the distance in millimeters between pixels
on a display device.
Response time of an LCD monitor or screen is the time in milliseconds (ms) that it
takes to
5 to 16 ms.
Brightness of an LCD monitor or LCD screen is measured in nits. A nit is a unit of
visible light intensity. The higher the nits, the brighter the images.
Contrast ratio describes the difference in light intensity between the brightest white
and darkest black that can be displayed on an LCD monitor. Contrast ratios today
range from 400:1 to 800:1. Higher contrast ratios represent colors better.
LED Monitors
LED short for light-emitting diode monitor, an LED monitor or LED display is a flat
screen, flat-panel computer monitor or television. It has a very short depth and is
light in terms of weight. The actual difference between LED and a typical LCD monitor
is the backlighting.
Advantages of LED Monitors
1.
2.
3.
4.
They are slim in design
Lower power consumption
Longer lifespan
Better colour and picture quality
Differences between CRT and LED or LCD Monitors
CRT Monitor
1. It consumes more power
2. It is less expensive
3. They are bulky and large in size
4. CRT provides low resolution
compared to LED
LED /LCD Monitors
It consumes less power
LED monitors are very expensive
They are light and thin in size
LED provide high resolution compared
to CRT
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Uses of Monitor
1.
2.
3.
4.
Monitor displays information on the computer to the user.
It serves as an interface between the user and the computer.
It produces soft copies of information.
Allows the user interact with the computer using keyboard and mouse.
PRINTER
A printer is an output device that take data stored on the computer or other device
and produce a hard copy of it. It is an output device used to produce text and graphic
on a physical medium such as paper.
Printers are the most popular computer peripherals and are commonly used to print
texts and images or photos. Printed information is termed as hardcopy.
PROJECTOR
Projector is an output device that can take images generated by a computer or Bluray player and reproduce them by projecting onto a screen. Projector can produce
either still images (slides) or moving images (video).
SPEAKERS / HEADPHONE
Headphones are output device that either plug into a computer line out or speaker.
Speaker or headphone is an output device used to produce sound from the
computer. They allow you to listen to audio from the computer.
PLOTTER
Plotter is an output device used to print vector graphics. Plotter uses pen, pencil, or
maker instead of toner to draw multiple and continues lines or images onto a paper.
They are used to print large images usually computer-aided designs (CAD). Plotters
differ from printers in that, plotters use continues lines to create images while
printers use a collection of dots
ADVANTAGES AND DISADVANTAGES OF OUTPUT DEVICES
CRT Monitors
Advantages of CRT Monitor
1.
2.
3.
4.
Less expensive than other display technology.
Fast response time.
They produce more colors
CRT also suitable for use even in dim or dark light.
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Disadvantages of CRT Monitor
1. Very bulky and take up large space on a desk
2. Not suitable for very brightly environment because less bright than LCD
3. They are large, heavy and bulky
4. Consume a lot of electricity and also produce a lot of heat
LCD Monitors
Advantages LCD Monitor
1. No radiation emission from the screen
2. Better under brighter conditions because of anti-glare technology
3. Lighter in weight with respect to screen size
4. Energy efficient because of lower power consumption
Disadvantages of LCD Monitors
1. Slightly more expensive than CRT
2. Suffer from a motion blur effect
3. Restricted viewing angles
4. Slow response times
Disadvantages of Graph Plotter
1. They are quite expensive.
2. The plotters are large in size, therefore, needs large space for installation
3. A plotter needs heavy maintenance
4. Plotters are not suitable for home use like printers.
Speaker
Advantages of Speakers
1. Usually long lasting and durable
2. Usually provided with the computer/laptop although these may not be the
best quality.
Disadvantages of Speakers
1. Can take up a lot of desk space compared to headphones
2. High volume may cause hearing impairment
3. High volume can distract people around you.
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Projector
Advantages of Projector
1. Projected screen causes no damage to the eye as compared to other screens
2. They provide a large screen viewing
3. They are cheap than a large TV
4. They are easy to use and install.
Disadvantages of Projector
1. It needs dark room to get better result.
2. Needs maintenance regularly.
3. Installation cost is more.
PERIPHERAL DEVICES
Peripheral devices are computer hardware that is added to the computer to expand
it operation or functionality.
Peripheral devices can be external or internal. For example, a printer is an external
device that you connect using a cable, while an optical disc drive is typically located
inside the computer case. Internal peripheral devices are also referred to as
integrated peripherals.
Types of Peripheral Devices
There are many different peripheral devices, but they fall into three general
categories:
1. Input peripheral devices
o
o
o
o
o
Mouse
Keyboard
Scanner
Webcam
Touchpad
3. Storage peripheral devices
o Hard disk or External disk
o Floppy disk
o CD/DVD
o Pen drive
o Flash memory cards
2. Output peripheral devices
o
o
o
o
Monitor
Printer
Speaker
Projector
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STORAGE DEVICE
Storage devices are devices that are used to holds data and information for future
use. They are used to store data temporarily or permanently. Examples of storage
devices are hard disks, floppy disks, CDs and DVDs, flash memory cards, USB flash
drives
A storage medium (media is the plural), also called secondary storage, is the physical
material on which a computer keeps data, and information.
A storage device is the computer hardware that records and retrieves data to and
from storage media.
Writing is the process of transferring data, or information from memory to storage
medium.
Reading is the process of transferring data, or information from storage medium into
memory
Capacity is the number of bytes (characters) a storage medium can hold.
Hard disk
CD/DVD
External hard disk
Pen drive
Floppy disk
Memory card
Storage devices
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DATA REPRESENTATION ON THE COMPUTER
The computer uses binary digit to represents data and information. The binary
system is a number system that has just two unique digits, 0 and 1, called bits.
A bit is the short form for binary digit. A Bit is the smallest unit of data the computer
can process.
A group of 8 bits as a unit forms a byte.
A byte provides enough different combinations of 0s and 1s to represent 256
individual characters. A kilobyte (KB or K) is equal to exactly 1,024 bytes. To simplify
memory and storage definitions, computer users often round a kilobyte down to
1,000 bytes. For example, if a memory chip can store 100 KB, it can hold
approximately 100,000 bytes (characters). A megabyte (MB) is equal to
approximately 1 million bytes. A gigabyte (GB) equals approximately 1 billion bytes.
A terabyte (TB) is equal to approximately 1 trillion bytes
The capacity of a storage medium measured by the number of bytes it can hold.
Storage Term
Kilobyte (KB)
Approximate Number of
Bytes
1 Thousand (1,000)
Exact Number of
Bytes
10
2 or 1,024
Megabyte (MB)
1 Million
(1,000,000)
220 or 1,048,576
Gigabyte (GB)
1 Billion
(1,000,000,000)
230 or 1,073,741,824
Terabyte (TB)
1 Trillion
(1,000,000,000,000)
240 or 1,099,511,627,776
CATEGORIES OF COMPUTER STORAGE
There are two main categories of computer storage and these are:
1. Primary Storage (main memory)
2. Secondary Storage (storage medium)
TYPES OF MAIN MEMORY
1. RAM (Random Access Memory
2. ROM (Read Only Memory)
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RAM
RAM (random access memory), also called main memory, consists of
memory chips that can be read from and written to by the processor.
It is the temporary working memory of the computer.
Most RAM is volatile, which means it loses its contents when the
power is removed from the computer. For this reason, you must save
any items you may need in the future. Saving is the process of copying
items from RAM to a permanent storage device such as hard disk.
ROM
Read Only Memory refers to memory chips for storing
permanent data and instructions. The data on most ROM chips
cannot be modified (hence, the name read-only). ROM is
nonvolatile, which means its contents are not lost when power
is removed from the computer. The ROM contains both PowerOn-Self-Test (POST) and Basic Input Output System (BIOS) instructions.
Differences between Random Access Memory and Read Only Memory
Random Access Memory (RAM)
Read Only Memory (ROM)
1. It is volatile
1. It is nonvolatile
2. Easily accessible by the user
2. Not easily accessible by users
3. Can be upgraded
3. Not usually upgraded
4. Storage contents are temporal
4. Storage content are permanent
SECONDARY STORAGE DEVICE
Secondary storage has been grouped into three main categories, these are
1. Magnetic Storage Device ( Hard Disk, Floppy Disk and magnetic tape )
2. Optical Storage Device ( CD and DVD )
3. Flash Storage Device ( Flash Drive and Memory Card )
MAGNETIC STORAGE DEVICE
Magnetic storage devices are storage mediums commonly used for large volumes of
data. Magnetic storage refers to any type of data storage using a magnetized
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medium. Magnetic storage is a form of non-volatile storage. This means that the data
is not lost when the storage device is not powered on.
Magnetic storage is widely used because it is relatively cheap in comparison with
other storage technologies. The storage capacity is also very large, making it
attractive for storing very large amounts of data.
Example magnetic storage device include, magnetic tape, floppy disk and hard disk.
Note
A disk is the material that data is written on and a drive is the device for
reading data on a disk. For example, hard disk contains the data while
hard drive reads the data on the hard disk.
MAGNETIC TAPE
Magnetic tape is a thin plastic with magnetic coating on one side on which data or
information is stored. Magnetic tape is a medium for magnetic recording, made of a thin,
magnetized coating on a long, narrow strip of plastic film.
VHS Video cassette
Audio cassette
Magnetic tape used
by computers
Technologies that use magnetic tape
Magnetic tape is one of the older types of magnetic storage media. The magnetic
tape recorder was invented in 1928 and was primarily used for analog audio
recordings. Before music CDs were introduced in the 1980s, portable music devices
used magnetic tape in the form of music cassettes. Early computers adapted this
technology to store digital information.
One of the major weaknesses is that information on a tape can only be accessed in a
sequential or serial fashion. This is fine if you want to listen to a whole music album
in sequence, but computer systems typically need to access data in a non-sequential
manner. For magnetic tape, this means you may need to fast forward through a lot
of tape to get to a specific piece of data. While magnetic tape is a very cheap way to
store data, the very slow access to the data meant that it was primarily used for
creating backups of data.
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Properties of Magnetic Tape
Property
Explanation
Space or capacity
Large storage capacity (terabyte or more)
Speed
The slowest of all of the storage media
Data access
Serial or sequential access
Cost
Cheap compared to other storage devices.
Advantages and Disadvantages of Magnetic tape
Advantages
Disadvantage
Can store large amount of data
Data access is very slow
Less expensive or cheap to buy
Recordings are done on only one side
It is good for data backups
Data can be altered by magnetic strong
magnetic field and dust.
FLOPPY DISK DRIVE (FDD) /DISKETTE
A floppy disk is storage medium that consists of a thin, circular,
flexible plastic film with a magnetic coating enclosed in a square
shaped plastic shell. A typical floppy disk is 3.5 inches wide and
has storage capacities up to 1.44 MB. Floppy disks are not as
widely used as they were 15 years ago because of their low
storage capacity.
Features of Characteristics of Floppy Disk
1. They are cheap. A floppy disk is not as expensive as a hard drive.
2. Easy to handle and transport (portable).
3. They have a write protection which protects your data from accidental
deletion
4. Less storage capacity.
5. Slow data transfer rate.
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Characteristics or Properties of Floppy disk
Property
Explanation
Space or capacity
The less storage capacity (up to 1.44MB)
Speed
The slower compared to hard disk
Data access
Direct access (not serial access like tape)
Cost
Very cheap.
HARD DISK DRIVE (HDD)
A hard disk is a storage device that contains one or more inflexible, circular platters
that store data, instructions, and information. It is the main and the largest storage
device for storing data, instructions, and the operating system.
The hard disk has a metallic case that protect its contents from damage. It has a
metallic disc called platters that holds data in magnetic form. Hard disks are
read/write storage media. That is, you can read from and write on a hard disk any
number of times. The size of hard disk is measured in gigabyte and is the largest
storage device of the computer.
on most computers.
FEATURES OR PARTS OF THE HARD DISK DRIVE
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Functions of the Parts
Platter: The platters are the circular discs inside the hard drive where data is stored.
Spindle: For spinning or rotating the platters. It keeps the platters in position and
rotates them.
Read/Write(R/W) head: For reading and writing of data from the platter.
Actuator arm: Controls the movement of the read/write heads.
Actuator: For controlling the actions of the Actuator arm.
Characteristics of a Hard Disk
1.
2.
3.
4.
The hard disk provides a large storage capacity.
It is much faster than the optical disk and floppy disk.
It is the primary media for storing data and programs.
It is more reliable than a floppy disk.
Advantages of HDD
1. It has a very large storage capacity
2.
3. It has Persistent storage
4. HDD easily replaced and upgraded.
Disadvantages of HDD
1.
2.
3.
4.
5.
It depends upon on moving parts
The disk surface can be damaged easily.
It consumes heavy power.
It makes more noise.
Its read/write speed is slower than RAM.
Differences between Hard disk and Pen drive
Hard disk
Floppy disk
1. Much larger storage capacity
2. Short access time
3. Stores data at high speed
4. Heavy in weight
5. Usually fixed and not potable
1. Low storage capacity
2. Long access time
3. Stores data at low speed
4. Lighter in weight
5. It is small and potable
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EXTERNAL HARD DISK
External hard drive is a storage device located outside the computer
that is connected through a USB cable or wireless connection. They
are mostly used for backups. They also called removable hard drive.
External hard disk is enclosed in an airtight, sealed case.
CACHE DISK
Disk cache is a cache memory that is used to speed up the process of storing and
accessing data from the host hard disk. It acts as a temporary storage area that the
comput
can retrieve data from easily and faster even more than RAM.
Cache memory is a small-sized type of volatile computer memory that provides highspeed data access to a processor and stores frequently used computer programs, and
data. It is the fastest memory in a computer, and is typically integrated onto the
motherboard and directly embedded in the processor or main RAM.
Cache disk operation diagram
OPTICAL DISC
An optical disc or media is a type of storage media that consists of a flat, round,
portable disc made of metal, plastic, and lacquer that is written and read by a laser.
(The spelling, disk, is used for magnetic and flash memory media, and disc is used for
optical media.) Optical discs used in personal computers are 4.75 inches in diameter.
Smaller computers, game consoles, and mobile devices, however, often use mini
discs that have a diameter of 3 inches or less.
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Some optical disc formats are read only, meaning users cannot write or save on the
media. Others are read/write, which allows users to save on the disc just as they save
on a hard disk. The three main types of optical discs are compact disc (CD), digital
versatile disc (DVD) and Blu-ray disc (BD).
Compact Disc (CD)
Digital Versatile Disc (DVD)
Blu-ray Disc (BD)
Compact Disc (CD)
A CD-ROM, or compact disc read-only memory, is a type of optical disc that users can
read but not write (record) or erase
hence, the name read-only. Manufacturers
write the contents of standard CD-ROMs. A standard CD-ROM is called a singlesession disc because manufacturers write all items on the disc at one time. Software
manufacturers often distribute their programs using CD-ROMs A typical CD-ROM
holds from 650 MB to 1 GB of data with the most common one being 700 MB. The
three types of CD are:
Compact disc read only memory (CD-ROM)
Compact dis-recordable (CD-R)
Compact disk-rewritable (CD-RW)
Burning is the process of writing on an optical disc. Some operating systems,
such as Windows, include the capability of burning discs.
Ripping is the process of copying audio and/or video data from a purchased disc
and saving it on digital media or on your computer
Digital Versatile Disc (DVD)
Although the size and shape of a CD and DVD are similar, a DVD stores data,
instructions, and information in a slightly different manner and thus achieves a
higher storage capacity. DVD quality also far surpasses that of CDs because images
are stored at higher resolution. Widely used DVDs are capable of storing 4.7 GB to 17
GB, depending on the storage techniques used.
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A DVD-ROM (digital versatile disc-read-only memory or digital video disc-read-only
memory) is a high-capacity optical disc on which users can read but not write or
erase. Manufacturers write the contents of DVD-ROMs and distribute them to
consumers. DVD-ROMs store movies, music, music videos, huge databases, and
complex software.
Blu-ray Disc (BD)
A newer, more expensive DVD format is Blu-ray, which has a higher capacity and
better quality than standard DVDs, especially for high-definition audio and video. A
Blu-ray Disc-ROM (BD-ROM) has storage capacities of 100 GB, with expectations of
exceeding 200 GB in the future. Blu-ray Disc (BD) drives and players are backward
compatible with DVD and CD formats.
A CD drive can only read CDs, a DVD drive can only read DVDs and CDs, and a Bluray drive can read CDs, DVDs, and Blu-ray discs. In other words, newer drives can
read older optical discs, but older drives cannot read newer optical discs.
Types of optical disc format
1. Read only optical discs - CD-ROM, DVD-ROM, and BD-ROM Discs
2. Recordable optical disc - CD-R, DVD-R, DVD+R and BD-R Discs
3. Rewritable optical disc - CD-RW, DVD-RW, DVD+RW and BD-RE Discs
Read Only Optical Disc
Read only optical disc is a type disc that users can read but not write (record) or
delete - hence, the name read-only. Manufacturers write the contents of standard
CD-ROMs, DVD-ROMs and BD-ROMs. A standard CD-ROM is called a single-session
disc because manufacturers write all items on the disc at one time and distribute
them to consumers. Software manufacturers often distribute their programs using
CD-ROMs or DVD-ROMs. Users cannot change the contents of these discs.
Recordable Optical Discs
Recordable optical disc is a multisession optical disc on which users can write, but
not delete or erase, their own items such as text, graphics, and audio.
Multisession means you can write on part of the disc at one time and continue with
the other part at a later time. Each part of a recordable disc, however, can be written
Recordable disc formats include CD-R, DVD-R, DVD+R and BD-R discs.
Rewritable Optical Discs
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Rewritable disc is an erasable multisession disc you can write on multiple times. CDRW overcomes the major disadvantage of CD-R because it allows users to write and
rewrite data, instructions, and information on the CD-RW disc multiple times instead of just once. Rewritable disc can be written on multiple times and also
erased. Rewritable disc formats include CD-RW, DVD-RW, DVD+RW and BD-RE discs.
Summary of disc formats
Optical Disc
Read
Write
Erase
Read Only Memory Optical Disc
CD-ROM, DVD-ROM, and BD-ROM
Yes
No
No
Recordable Optical Disc
CD-R, DVD-R, DVD+R and BD-R
Yes
Yes
No
Rewritable Optical Disc
CD-RW, DVD-RW, DVD+RW and BD-RE
Yes
Yes
Yes
Caring for optical discs
Below are some guidelines for the proper care of optical discs.
1.
2.
3.
4.
5.
Never bend a disc; it may break.
Do not expose discs to excessive heat or sunlight.
Do not touch the underside of discs.
Aways hold a disc by its edges.
Do store the disc in a jewel box when not in use.
Uses of Optical Discs
CDs, Blu-ray, and DVDs are commonly used for the following purposes.
1.
2.
3.
4.
They are used for data transfer between devices.
These are used to deliver software to customers.
They are used hold large amounts of data, like videos, photos, music, and more.
Optical discs are used for making backups.
Note: The order of arrangement of storage devices according to their capacity
Hard Disk Drive > Memory Card and Pen Drive > CD > Floppy Disk
Decreasing order in Capacity
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The order of arrangement according to Access Time
RAM > Hard Disk Drive > Pen Drive > CD-ROM Drive
Decreasing order in access time
USES OR IMPORTANCE OF STORAGE DEVICES
1.
2.
3.
4.
They are used for storing data or information on the computer.
For making backups
For transferring information from one device to another.
For sharing information with others.
ASSESSMENT TASK
MULTIPLE CHOICE
5. Which processor was used by third
generation computers?
A. Transistors
B. Vacuum tube
C. Integrated Circuit
1. The generation of computers that uses
the vacuum tube as its pr
A. First generation
B. Second generation
C. Third generation
6. Which of the following devices
displays information on the computer
to the user in a softcopy?
A. Mouse
B. Monitor
C. Printer
2. Computers made from 1964 to early
1970s can be found under which
generation?
A. First generation
B. Second generation
C. Third generation
7. The number of horizontal and vertical
pixels in a display device is called
A. Resolution
B. Pixel
C. Dot pitch
3. The type of mouse that uses a hard
rubber ball to cont
A. Mechanical Mouse
B. Wireless Mouse
C. Optical Mouse
8. The smallest unit of data the computer
can process is called.
A. Bit
B. Byte
C. Kilobyte
4. Mouse that requires power in a form of
batteries is called?
A. Mechanical Mouse
B. Optical Mouse
C. Wireless or cordless Mouse
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9. The fastest memory in the computer
7. Identify two (2) input devices that
convert hard copy pictures or images
into a digital format.
8. Explain the following terms
i. Read only optical disc
ii. Recordable optical disc
iii. Rewritable optical disc
A. Read Only Memory
B. Random Access Memory
C. Cache Memory
10. The largest storage device of the
A. Hard disk
B. Floppy disk
C. Pen drive
9. State four (4) characteristics of fourth
generation-computers.
11. Which of the following has the lowest
storage capacity?
A. Hard disk
B. Floppy disk
C. Pen drive
12. Large icons that populate the righthand side of windows 10 start menu is
known as
A. Icons
B. Tiles
C. Thumbnail
10. State two (2) differences between
manual input device and automatic
input device.
11. Identify any four (4) ways of
protecting your optical disc from
damage.
12. State two uses each of the following
devices
a. Mouse
b. Keyboard
c. Monitor
STRUCTURED QUESTIONS
2. What is generation of computers?
13. Explain the term peripheral devices
and give five examples
3. State three characteristics of second
generation of computers.
4. State four characteristics of third
generation of computers
14. Explain the following
i. Reading
ii. Writing
iii. Capacity
5. State three difference between second
and third generations of computers
15. List the parts of the computer hard
disk and state their functions.
16. Mention three difference between
hard disk and pen drive
6. Explain the following terms;
a. Input device
b. Output device
c. Storage device
17. Give four uses of storage devices
20. Write three differences between
RAM and ROM
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CONTENT STANDARD 2
DEMONSTRATE THE USE OF THE FEATURES OF THE WINDOWS DESKTOP
Indicators
At the end of this content, learners will be able to:
Discover the new Windows Operating System (Start screen, Use of tiles, Taskbar
buttons, Preview thumbnails)
Practice file management techniques (file and folder management)
THE NEW WINDOWS OPERATING SYSTEM
The desktop is a graphical user interface that appears after booting the computer. It
can also be seen as a graphical user interface that provides quick access to programs
and information.
The desktop is the screen where all icons are arranged on the computer. Like the top
of an actual desk, it serves as the surface for your work. All your icons, files, open
programs and folders appears on the desktop.
FEATURES OF COMPUTER DESKTOP
The desktop is the screen you see after you turn on the computer. The desktop
contains start button, taskbar, icons, files, folders and programs.
The main features of computer desktop are;
1. Icons
2. Taskbar
3. Wallpaper or Background
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Wallpaper or Background
Opened windows
Start button
Taskbar
Notification area
Cortana
Windows 10 Desktop
TASKBAR
The taskbar is a bar located at the bottom of the desktop. It contains the start button,
icons of running application, pinned programs, Cortana and notification area.
ICONS
Icons are small pictures that represent files, folders, programs and other items on the
computer. Icons provide quick access to specific programs. To open a program on the
desktop, just double-click on the icon that represent the program that you want to open.
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The default icons on windows 10 desktop
This PC
Recycle Bin
Network
Control panel
Note that by default only the recycle bin will appear on the desktop. You can add the
other icons anytime you want.
This PC (My Computer)
This PC opens window, which displays all local and network drives on your computer.
It also displays all peripheral devices currently connected to the computer. This PC is
also referred to as My Computer on older windows.
Recycle Bin
The recycle bin contains deleted files and folders from the computer hard disk. All
deleted items on the computer are stored temporarily in the recycle bin. Items in the
recycle bin may be restore to its original location or remove completely from the
computer.
Control Panel
The control panel displays all the available settings that you can change on your
computer system.
Network or Network places
Network places displays the networking connectivity of your computer. You can use
network places to connect to other computers on the network. Network icon was
formerly known as My Network Places.
This icon is where all your files and folders are stored. Folders such as Desktop,
Downloads, Documents, Pictures, Music, Video, links etc. are kept here.
IMPORTANCE OF ICONS
1. For easy identification of item on your computer
2. To access installed programs quickly
3. It serves as a shortcut to access programs or data.
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TASKBAR
The taskbar is a long horizontal bar located at the bottom of the desktop. It contains the
start button, icons of running applications, pinned applications, Cortana and notification
area. The major function of the taskbar in allowing users to locate and launch programs
through Start and the Start menu, or view any program that is currently open.
The taskbar has been divided into three main sections. These are;
1. Start button
2. Pinned applications
3. Notification area / system tray
Functions of the Taskbar
1. To quickly launch or open pinned programs.
2. It helps users to view currently open programs.
3. It allows users to locate and launch programs through the start menu.
Notification area
This area displays small icons that notify you about things that happening on your
computer. It also displays the time and date, volume, and network connections of
the computer system.
Pinned Program
Frequently used applications can be pinned to the taskbar for easy access. Users can
also pin the favorite programs on the taskbar for quick access. When you open any
activity, a small window of that activity appears on the taskbar. This is called the tab.
Cortana: The Cortana is a new intelligent personal assistant. It is an upgrade of the
old windows help system. To get started with the Cortana, type a question in the
search box on the taskbar or simply select the microphone icon and talk to Cortana.
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START BUTTON
The start button is located at the lower left corner of the taskbar. The start button
provides access to all commands and programs on the computer. It can be used to
open or start a program, find and open files, and shut down the computer.
Functions of Start Button
1. To launch applications or programs
2. Fast access to frequently used programs
3. To shut down the computer.
START MENU OR SCREEN
Microsoft discontinued with the start menu but it is now back on the taskbar. It is
now a combination of old start menu and the windows 8 start screen. The most
used applications are listed on the left side of the start menu for easy accessibility.
All programs link, in previous windows version has been replaced with All Apps
link.
All apps
Features of Start screen
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Function of the start screen or menu
1. To access the most used application
2. It provides quick access to all Apps or programs on the computer.
3. Contains the tiles for installed Apps.
Tiles
Tiles are shortcuts for Windows 10 Apps available in the Microsoft Store. Tiles are
the large icons that populate the right-hand side of the start menu. It contains icons
such as Calendar, Mail, weather, Calculator, Photos, Microsoft Edge browser,
Microsoft store and more.
Functions of windows tiles
1. It displays useful information at glance without opening the actual app.
2. To launch application with just a single click.
Thumbnail
Thumbnail shows a preview of a folder or pictures and videos for users to easily find
what they are looking for. It is a small image that is used to identify a file or folder by
its contents. It gives a brief description of a file or folder by showing a small image of
the file or items contain in that folder.
Functions of preview thumbnail
1. Thumbnail shows a preview of files and folders for easy identification.
How to enable thumbnail preview in windows 10
1.
2.
3.
4.
5.
6.
Click on File Explorer from the taskbar
Click on View from the menu bar
Click on Option
Select View from the popup menu
Uncheck
Click on Apply to save changes.
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FILES MANAGEMENT TECHNIQUE
FILES
A File is a collection of related information save on a disk. The information can be of
different types such as text, data or images. Similar to the way you keep files or
documents in file folders for easy reference. An icon of a file normally shows the type
of program used to create that file. Files are open or launch by double clicking on its
icon.
FOLDER
A folder is an electronic container for storing documents, files and other folders. A
folder may contain other folders known as Sub folder. Most folder icons appear as
yellow colour. Folders that contain information about the operating system is called
system folder. This type of folders is created by the operating system and not the
user. Folders that contain information about all installed programs are called
program folders.
A folder within another folder is called a sub-folder.
The main folder is called the parent folder.
USES OF FOLDERS
1. It helps users to locate important file quickly
2. For keeping related files together
3. For organizing files on the computer.
How to Create a Folder on the Desktop
1. Right-click on an empty space on the desktop
2. Select New from the menu
3. Select Folder from the pop-up menu
4.
5. Press Enter from the keyboard
Note: the shortcut keys for creating new folder is CTRL + SHIFT + N
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RENAMING A FOLDER ON THE DESKTOP
Renaming is the process of changing the name of a folder or giving folder a new
name. Folders are renamed for easily identification. A file or folder maybe renamed
when the name of that file or folder exist already or when the content of the folder
has changed. There are some characters or symbols that cannot be used for renaming
a folder. Examples include: *, :, , /, \, |, >, <, ?.
Steps involved in renaming a folder
1.
2.
3.
4.
Right-click on the folder
Select Rename from the popup menu
Type the new name in the textbox provided
Press Enter on the keyboard
2
3
Basic 4 has been rename to basic 5
FILE NAMING CONVENTION
File naming convention is a systematic method for naming files that will make them
easier to retrieve later. All file systems follow the same general naming conventions for
an individual file. File name is made up of a base file name and file extension separated
by a period (.).
Importance of File Naming Conventions
1. It helps users know the content of a file without opening it.
2. It helps users find or identify files even if they are no longer in their original location.
3. Help manages file more easily.
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File-naming conventions when saving files
1.
2.
3.
4.
5.
6.
Case sensitivity upper and lower case are different
Maximum length is 260 characters (for Windows)
Spaces allowed
Digits allowed
\
File names not allowed (con, nul, prn). You cannot use any of them as file
name; windows will not allow you to use them.
FILE EXTENSION
File extension or file name extension is suffix at the end of a filename that indicates
what type of file it is. A file extension is a three or four-letter abbreviation found at
the end of a file name after a period or full stop. In Microsoft Windows, the file name
extension is a period that is often followed three or four characters but may also be
one or two long.
Importance of File Extensions
1.
2.
3.
4.
File extensions provide clues to the file contents.
OS uses extensions to determine which application created the file.
It indicates the file type or file format of the file.
It helps users identify the type of document.
Examples of files and their file extensions
Extension
Type of Document
Application
.doc or .docx
Word processing document
Microsoft word
.txt
text document
Windows text
.xls or .xlsx
Workbook
Microsoft excel
.ppt or pptx
PowerPoint Presentation
Microsoft PowerPoint
.gif or .jpg or .png
Images
Windows image viewer
.mp3 or .mp4
Audio Video
Windows media
.pdf
Portable Document Format
Adobe acrobat
.htm or .html
Web page
Hypertext Markup Language
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USER ACCOUNT
A user account allows you to sign in to Windows 10 computer. By default, your
computer already has one user account, which you created during setting up
Windows for the first time. But if you plan to share your computer with others, you
can create a separate user account for each member of your home or office.
Windows requires at least one user account. You specify that account when you are
completing the installation processes, or the first time the computer starts after
Windows has been installed. Windows assigns this first account as an administrator
account so that the account can be used to manage the computer. It is not possible
to sign on to the computer without a user account.
A user is the person who is using the computer.
A user account is an account that a person uses to sign in to a computer.
Each user account is either:
A Microsoft account, which is any email address that has been registered with
the Microsoft account service
A local account that exists only on a single computer and is not associated
with a specific email address.
User account permissions
The system actions that a user can perform are governed by the type of account he
or she signs in with. An administrator account has higher-level permissions than a
standard user account, which means that an administrator account owner can
perform tasks on your computer that a standard user account owner cannot.
Standard user account allows a user to do things that affect only his or her account,
including:
Change or remove the password.
Change the user account picture.
Change the theme and desktop settings.
View files stored in his or her personal folders and files in the Public folders.
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Administrator account is necessary to do things such as:
Create, change, and delete accounts.
Change security-related settings.
Install and remove applications.
Access system files and files in other user account profiles.
User Account Control
User Account Control (UAC) protects your computer from changes to Windows system
settings by requiring that only an administrator permit certain types of changes. Each
area of the Windows interface that requires administrator permission is labeled with a
security icon.
When you attempt to access or change protected Windows settings, a User Account
Control dialog box appears, asking for confirmation that Windows should continue the
operation.
The User Account Control message box varies depending on your account and the action
continue the operation.
administrator accounts on the computer. To continue the operation, you click one of the
administrator accounts, enter its password if any in the box that appears, and then click
Yes.
operation by simply clicking that account and then clicking Yes. This is one of the reasons
rator account on the computer has a password.
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Creating a local user account on windows 10
1. Click on the Start button
2. Select Settings
3. Select Accounts
4. Then select Family & other users. (In some versions of Windows, you will
see Other Users.)
5. Select Add someone else to this PC.
6. Select I don't have this person's sign-in information, and on the next page,
select Add a user without a Microsoft account
7. Enter a user name, password, or password hint or choose security questions
and then select Next to complete your account.
Creating local user account on windows 10 PC
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FILES AND FOLDER PERMISSION LEVEL
File permissions regulate file access. They allow you to control who can read, write, or
execute any file or folder. Every file and every folder in Windows have its own set of
permissions. Permissions can be broken down into Access Control Lists with users and
their corresponding rights.
Standard Permission Level Types
There are six standard permission types which apply to files and folders in Windows.
1.
2.
3.
4.
5.
6.
Full Control
Modify
Read & Execute
List Folder Contents
Read
Write
Each level represents a different set of actions users can perform. Users can also set their
own unique folder permissions or create a variation on any of the standard permission
levels. Within each of the permission levels are many possible variations.
How to change or edit folder and file permission
some permissions.
Before you can edit any permissions, you must to have ownership of the file or folder be
an administrator. If the owner is another user account or a system account like Local
Here are the steps to modify the permissions of folders and files:
1.
2.
3.
4.
5.
6.
Right-click on the file or folder you want to edit
Select Properties
Click on Security
Click on Edit
Check the box of the permission you want to allow or deny.
Click on Apply and then OK.
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ASSESSMENT TASK
A. .docx
B. .wod
C. .txt
9. Which of the following is not an
extension for image file?
A. .Jpg
B. .Png
C. .img
MULTIPLE CHOICE
1. The screen that appears after turning
2.
3.
4.
5.
A. Wallpaper
B. Monitor screen
C. Desktop
All the following are features of
computer desktop except
A. Taskbar
B. Title bar
C. Icons
D. Wallpaper
The long horizontal bar located at the
bottom of the desktop is called
A. Taskbar
B. Title bar
C. Start bar
Small picture that represents installed
program is termed as
A. File
B. Folders
C. Icons
Deleted items on the computer can
STRUCTURED QUESTIONS
1. What is desktop? Out the main features
of a desktop.
2. Discuss the functions of the taskbar,
thumbnails, start screen, and tiles.
3.a. What is file naming convention?
b. Outline three importance of file
naming convention.
4. a. What is file extension?
b. state three importance of file
extension
5. List the steps involved in creating folder
on the desktop.
A. Recycle bin
B. User file
C. My documents
6. Documents on the computer are kept
6. Identify possible applications that
produce the following file extensions:
docx, xls, pdf, jpg and ppt.
7. Identify the various parts of the
Windows taskbar.
A. Files
B. Folders
C. Icons
7. The suffix at the end of a file name
after a period or full stop is called
A. Path name
B. File name extension
C. File naming convention
8. The file name extension for
Microsoft word is
8. What are the procedures used to
rename a folder?
9. Identify three (3) importance of icons
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SUB-STRAND 2
TECHNOLOGY IN THE COMMUNITY
CONTENT STANDARD
DEMONSTRATE THE USE OF TECHNOLOGY IN THE COMMUNITY
Indicators
At the end of this content, learners will be able to:
Describe and give examples of at least five technology tools for learning.
Demonstrate the use of at least three technology tools identified.
Discuss the benefits of using technology tools in learning.
Examine the negative impact of computers and computer use on the environment
Propose environmentally responsible practices that can be used to reduce the negative
impact of computers and computer use on the environment
TECHNOLOGY TOOLS FOR LEARNING
Technology is the use of scientific knowledge for practical purposes or application,
whether in industry or our everyday lives. So basically, whenever we use our scientific
knowledge to achieve some specific purpose means we are using technology. We
apply technology in almost everything we do in our lives.
Educational Technology (edutech) is the use of hardware and software or technology
tools to improve the processes of teaching and learning.
Hundreds of educational technology tools have been created with the purpose of
helping student improve their academic activities and facilitating communication
between teachers and learners.
Below are some examples of technology tools that can be used to support learning
1.
2.
3.
4.
Encarta
Mavis beacon
Spreadsheet
Scratch
5. Presentation
6. Virtual museum
7. Google classroom
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USES OF TECHNOLOGY TOOLS
Encarta
Microsoft Encarta was a digital multimedia encyclopedia publish by Microsoft
Corporation from 1993 to 2009. Encarta was a multimedia product, with text,
pictures, sound, short videos and more used for leaning various subjects. It discusses
knowledge about science, history, arts, animal life, environment, and more. It helps
student to access information on various subjects or topic with a single click.
Uses of Encarta
1. For improving learners reading skills in English.
2. It provides step-by-step instruction for solving math problems
3. It helps students to learn on their own.
Scratch
Scratch is a free visual programming language that allows students to create their
own interactive stories, games and aminations. As student design scratch projects,
they learn to think creatively and reason systematically.
Uses of Scratch
1. It helps children develop their logical thinking
2. It improves
social skills
3. Scratch help children to lean coding concept.
Mavis Beacon
Mavis beacon is an application software program design to teach touch typing".
How to use Mavis beacon
1. Open the program by double clicking on the Mavis beacon icon.
2.
3. If this is your first time, sign in by tying your first name and last name and
select your age. If not your first time, click on your name on the class list.
4.
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Google Classroom
Google Classroom is a free web based social tool for leaning. It allows students to
post questions and receive answers from their teachers and fellow students. Teacher
can post question and lesson materials to student at home. Teachers can create,
distribute, and mark assignments all in google classroom.
Spreadsheet
Spreadsheet is a software that is used to organize and calculate numerical data.
Spreadsheet is made up of rows and columns that stores numerical data, perform
calculations, and organize the data into meaningful information.
Uses of Spreadsheet
1. For entering, sorting and storing of data.
2. For performing calculations
3. For data collections
Virtual Museum
Virtual museum is a collection of digitally recorded images, sounds, text and other
data of historical, scientific or cultural interest that can be accessed through
electronic media or web. As with a traditional museum, virtual museum can be
designed around specific objects such as art museum or natural history museum or
can consists of online exhibitions
BENEFITS OF USING TECHNOLOGY TOOLS IN LEARNING
1.
2.
3.
4.
5.
6.
Technology promotes active participation of student in teaching and learning
Technology motivates students to learn.
It creates new ways for students to lean
Technology encourages collaboration.
It helps student to lean on their own.
It encourages communication between students and their teachers.
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NEGATIVE IMPACT OF COMPUTERS AND COMPUTER
USE ON THE ENVIRONMENT
Computers have a negative impact to the environment as well as the usage of
computers. Many electronic products such as computers are discarded with a predicted
amount of 20- 50 million tons generated every year, most of this waste ends in landfills.
This waste has a negative impact on the environment since the heavy metals and
dangerous chemicals make up these electronics and pose health risks to the entire
country. These heavy metals contain beryllium, cadmium, lead and mercury and the
waste contain chemicals which are toxic and help contribute to global warming.
people using them for various purposes on a daily basis. While computers have certainly
brought numerous benefits and improvements, they also have a negative impact on the
environment. In this lesson, we will discuss some of the ways in which computers harm
the environment and the steps that can be taken to reduce these impacts.
1. Energy Consumption
One of the biggest environmental impacts of computers is their energy consumption.
The production and use of computers require a significant amount of energy, which
often comes from non-renewable sources such as coal and natural gas. This energy
consumption contributes to greenhouse gas emissions, which are a major contributor to
climate change. People who use computers never turn the actual device off which
wastes a large amount of electricity that could have been potentially saved and reduce
the amount of electricity produced by burning fossil fuels.
2. E-waste
Another major negative impact of computers on the environment is the generation of
electronic waste, or e-waste. E-waste refers to electronic devices that are no longer
wanted or needed, and can include computers, laptops, printers, smartphones, and
other electronic devices.
When electronic devices are discarded, they often end up in landfills where they can
release harmful chemicals into the environment. These chemicals can contaminate soil
and water, posing a threat to plants, animals, and even humans. In addition, the
extraction of the materials used in electronic devices, such as metals and plastics, can
also have negative environmental impacts. Agbogbloshie in Ghanan is one of the largest
e-waste dumping site in the world
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Electronic waste dumped site (Agbogbloshie-Ghnan)
3. Air Pollution
The production of computers also contributes to air pollution. The manufacturing of
computers involves the use of various chemicals and materials, many of which can
release harmful pollutants into the air. These pollutants can include carbon dioxide,
nitrogen oxides, and other greenhouse gases, which can contribute to air pollution and
climate change. Also, Electronic waste contains gold, silver and cooper, and people in
developing countries attempt to extract these materials by burning the substance which
releases hazardous smoke into the air and creates a poor air quality with so much
pollution.
4. Water Pollution
In addition to air pollution, the production of computers can also lead to water pollution.
The manufacturing process for computers uses large amounts of water, and this water
can become contaminated with chemicals and other pollutants. This contaminated
water poses a risk to human health when it is dumped into rivers and other bodies of
water since it can harm aquatic life and potentially get into the water supply.
Water pollution can have a variety of negative impacts on the environment, including
the destruction of ecosystems and the loss of biodiversity. It can also have economic
consequences, such as the loss of fishing and other industries that rely on clean water.
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5. Deforestation
The production of computers can also contribute to deforestation. Many of the materials
used in the production of computers, such as plastics and metals, are derived from trees
and other natural resources. The demand for these materials can lead to the destruction
of forests, which can have negative impacts on the environment, including soil erosion
and loss of habitat for plants and animals. Computers also cause unnecessary waste of
paper by printing files and emails; most office waste is made out of paper and paper are
made from trees which also contribute to deforestation.
Computers have a negative impact on the health of its user such as the following
diseases: arthritis, sleeping disorders such as frequently waking up during the night or
having insomnia, back pain for staying in the same sitting position, headaches and poor
attention spam in which you regard single tasks as boring and makes you anxious.
Watching the screen of the computer that contains lights can burn your retina and cause
blindness.
PROPOSED RESPONSIBLE PRACTICES TO REDUCE THE
NEGATIVE IMPACT OF COMPUTERS AND COMPUTER USE
ON THE ENVIRONMENT
The use of computers has numerous benefits and has brought significant advancements
to our society. However, it is important to recognize the negative environmental impacts
of computers, including energy consumption, the generation of e-waste, air and water
pollution, and deforestation.
There are steps that can be taken to reduce the negative environmental impacts of
computers. Some of these steps include:
Energy-efficient computers: Choosing computers that are designed to be energyefficient can help reduce their overall energy consumption and greenhouse gas
emissions. Look for computers with the ENERGY STAR label, which indicates that
they meet strict energy-efficiency standards set by the Environmental Protection
Agency (EPA). We have to try to reduce the amount of power the computer uses
by using the computer only when it's needed and turning the computer off when
we are not using it. Some other small things we can do is adjusting the computer
brightness, setting, and using LCD monitors instead of CRT.
E-waste recycling: Properly disposing of e-waste is crucial for reducing its
environmental impact. Many communities offer e-waste recycling programs,
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where old electronic devices can be safely and responsibly recycled. This helps to
prevent e-waste from ending up in landfills and reduces the demand for the
extraction of new materials.
Green Manufacturing: Consumers can also support companies that are
committed to environmentally-friendly manufacturing practices. These
companies often use sustainable materials and employ eco-friendly production
Paper Waste recycle: Computers produce a large amount of paper waste, mostly
by printing. To reduce paper waste, we must recycle the paper that can be reused.
Recycling electronic waste
Recycling electronic waste is a long and expensive process, most electronic waste goes
through a recycling system called the WEEE (Waste Electrical and Electronic Equipment).
All the hard drives and memories are destroyed to corrupt all the data, but only 95%98% is completely recycled. Although there is a series of events needed to recycle
electronic waste:
o
o
o
o
o
o
Firstly, all the items are sorted using their hands, then the copper and batteries are
extracted
Items are shredded to small sizes and thoroughly sorted, all data is destroyed at
this point
All small debris is shaken to make enough room to be broken down once again, all
dust extracted is disposed of.
Using magnets, steel and iron is removed from the debris
Aluminum, copper and brass is separated from the non- metallic content
Water separates glass and plastic content
Many countries contain facilities in which electronic waste is recycled such as: Australia,
UK, the United States and Canada. Many developing countries contain vast landfills like
Ghana, Nigeria, and India. Continents like Africa are known to contain many landfills of
electronic waste, in which is hazardous to the environment and the entire population.
Taking steps to reduce these impacts, such as choosing energy-efficient computers,
recycling e-waste, supporting companies that use eco-friendly manufacturing practices,
and reducing our overall consumption of computers, can help to safeguard the
environment and make sure our world has a viable future. It is up to each of us to take
responsibility for the environmental impact of our actions and make choices that are
better for the environment.
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ASSESSMENT QUESTIONS
MULTIPLE CHOICE
7. All the following can help reduce the
negative impact of computers on the
environment except
A. Green manufacturing
B. E-waste recycling
C. Use of energy efficient computers
D. Do not switch of the computer
after use.
8. Software used to organize and
calculate numerical data is a form of
rows and columns is called?
A. Encarta
B. Word processors
C. Spreadsheet
9. Which the following is not a negative
effect of computers on the
environment?
A. E-waste
B. Deforestation
C. Air pollution
D. Energy saving
1. The practical use of scientific
knowledge to solve problems in our
everyday life is termed as
A. Educational technology
B. Technology
C. Scientific knowledge
2. The introduction of technology in the
classroom to improve teaching and
learning is known as
A. Educational technology
B. Technology
C. Scientific knowledge
3. All the following are examples of
technology tools in the classroom
except
A. Google classroom
B. Encarta
C. One drive
D. Mavis Beacon
4. Which of the following tool help
students improve their typing skills
A. Encarta
B. Spreadsheet
C. Scratch
D. Mavis Beacon
5. Electronic devices that are no longer
wanted or needed and disposed of are
termed as
A. Water waste
B. E-waste
C. Metal waste
6. The most common landfill site in Ghana
is located in
A. Kejetia
B. Agbogbloshie
C. Nima
D. Kasoa
STRUCTURED QUESTIONS
1. Explain the term technology tools
2. What is Educational Technology?
3. Identifying any four (4) technology
tools that aid learning.
4. State the use of the tools identified in
question 3 above.
5. Outline four (4) benefits of using
technology in learning
6. Identify any four negative impacts of
computer on the environment
7. Propose any four ways to reduce these
negative impacts identified in (7)
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SUB-STRAND 3
HEALTH AND SAFETY IN USING ICT TOOLS
CONTENT STANDARD
HOW TO APPLY HEALTH AND SAFETY MEASURES IN USING ICT TOOLS
Indicators
At the end of this content, learners will be able to:
Describe Current Regulatory Requirements and Potential Computing-Related
Disorders.
Describe Safety measures in using ICT tools
Examine workstation health risk assessment methods
Explore safety measures at workstations
Regulatory Requirements and Potential ComputingRelated Disorders.
The long-term use of computers has been linked to a range of potential health problems,
or "computing related disorders" (CRDs). The health problems most highly associated
with the use of computer equipment are upper limb disorders, eye problems, stress and
fatigue, and skin complaints. Upper limb disorders are term used to describe a range of
conditions affecting the fingers, hands, arms and shoulders.
A hazard describes anything or situation that could be harmful to the user as they use a
computer. For example, prolonged and improper use of the keyboard and mouse can
cause repetitive strain injury. Additionally, using the wrong body posture can lead to
body pain and other health issues over time.
Health and Safety issues Associated with the of ICT Tools
1.
2.
3.
4.
5.
6.
Radiation from mobile phone causing cancer
Vision impairment from monitor
Hearing impairment from radio and PA system
Repetitive strain injury (prolonged and improper use of mouse and keyboard)
Carpal tunnel syndrome (pains in the hand and arm)
Computer vision syndrome (group of eye and vision related problems)
7. Posture position injuries (neck and back pain, headache, arm and shoulder
pains caused by bad sitting position)
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HEALTH HAZARDS ASSOCIATED WITH ICT DEVICES
HEALTH HAZARDS OF COMPUTER
1. Long term exposure to the monitor affects vision also known as vision impairment.
2. Improper sitting posture can cause waist, back, and neck pains.
3. Long-term usage of non-ergonomics keyboard causes wrist pains.
4. Radiation from the monitor causes eye and skin irritation.
HEALTH HAZARDS OF MOBILE PHONE
1. Loud ringing tone can cause hearing impairment or damage our hearing system.
2. The mobile phone also emits radiation which can cause cancer.
PUBLIC ADDRESS SYSTEM HEALTH HAZARDS
Public address system is an electronic system consisting of microphone, amplifiers, and
speakers used to amplify speech and music.
Loud or high volume of public address system can affect or damage our hearing (hearing
impairment).
HEALTH HAZARD OF TELEVISION OR MONITOR
Long term exposure to television can affects vision (vision impairment).
HEALTH HAZARD OF RADIO
Loud volume of radio can cause hearing impairment. This can cause permanent damage
to the hearing mechanism.
Preventive Measures or Safety Precautions for using ICT Tools
1.
2.
3.
4.
5.
6.
7.
8.
Do not answer or receive calls when charging mobile phone.
Avoid plugging ICT tools in damage socket.
Do not overload the socket
Correct body position when using the computer.
Distant yourself from the monitor when using the computer.
Avoid sitting closer to your television.
Reduce the ringing tone of your mobile phone.
Use Uninterruptible Power Supply (UPS) to ensure constant flow of power to the
computer
9. Use ergonomic keyboard to reduce wrist pain.
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WORKSTATION HEALTH RISK ASSESSMENT METHODS
Computer users are a key component in any computer system. Protecting users is
just as important as protecting hardware, software, and data. The widespread use of
computers has led to some important user health concerns. Users should be
proactive and minimize their chance of risk. The following sections discuss health
risks and preventions, along with measures users can take to keep the environment
healthy. The long-term use of computers has been linked to a range of potential
health problems, or "computing related disorders" (CRDs).
Computers and health risk
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Upper and lower back pain due to bad posture
Long term exposure to the monitor affects the eye.
Back and neck pains.
Strain in Legs and Feet.
Wrist pains.
Eye and skin irritation.
Repetitive strain injury (prolonged and improper use of mouse and keyboard)
Plugging all your system into one socket
Using damage socket
Faulty electrical connections,
SAFETY MEASURES AT WORKSTATIONS
The following measures will help reduce the various health risk associated with the use
of workstations.
To reduce back and neck pains:
Adjusting the chair for comfort
Re-positioning of devices,
Stand up and walk around every hour or so.
Slowly lean your torso over to one side of the chair and then the other to stretch
your sides and spine.
Stand up and put your hands together, elbows out, then slowly twist to the left and
then to the right.
Keep your neck straight as much as possible.
Move your shoulders around in small circles, first in one direction and then the
other.
Slowly bring your chin down to your chest, hold for 3 seconds, and then release.
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Keeping the arm and wrist free from pain:
Reach your arms out in front of you and draw big circles with your wrists, first in one
direction and then the other.
Stretch your arms out to the side as far as you can and then above your head as high
as you can to stretch your arms, wrists and back.
Interlock your fingers and then push them out in front of you, with palms facing out.
To reduce the risks of visual problems (Protecting your eye)
1. Tilt the screen slightly to avoid reflections or glare.
2. Make sure the screen is not too close to your face.
3. Use large fonts.
4. Every 10 to 15 minutes, take an eye break.
5. Blink your eyes every five seconds.
6. If you wear glasses, ask your doctor about computer glasses.
7. Put the screen either at eye level or slightly lower.
8. Reduce the contrast and brightness of your screen by adjusting the controls.
9. Frequently look away from the screen and focus on faraway objects.
10. Have regular eye examinations to check that any blurring, headaches and other
associated problems are not caused by any underlying disorders.
Preventing computer-related muscle and joint injuries:
Sit at an adjustable desk specially designed for use with computers.
Have your keyboard at a height that lets your elbows rest comfortably at your
sides. Your forearms should be roughly parallel with the floor and level with the
keyboard.
Adjust your chair so that your feet rest flat on the floor, or use a footstool.
Use an ergonomic chair, specially designed to help your spine hold its natural curve
while sitting.
Use an ergonomic keyboard so that your hands and wrists are in a more natural
position.
Take frequent short breaks and go for a walk, or do stretching exercises at your
desk. Stand often.
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ASSESSMENT TASK
7. All the following are possible
measures to protect eye except.
A. Blink your eyes every five
seconds.
B. Use large fonts
C. Wash your eyes frequently
D. Every 10 to 15 minutes, take an
eye break.
MULTIPLE CHOICE
1. All the following are health hazards
of using the computer except
A. Neck pain
B. Backache
C. Toothache
D. Wrist pain
2. Which of the following is an effect of
laud ringing tone of mobile phone
A. Hearing impairment
B. Vision impairment
C. Headache
3. To avoid wrist pain, one must us
A. Ergonomics keyboard
B. QWERTY keyboard
C. Dvorak keyboard
4. All the following can cause hearing
impairment except
A. Mobile phone
B. Computer
C. Public address system
D. Radio
5. The following are possible hazards
of prolonged use of the computer
system except
A. Neck and wrist pain
B. Backache
C. Tuberculosis
D. Eye strain
6. Which of the following is not a safety
measure to consider in ICT
environment?
A. Not overloading the socket
B. Proper sitting position
C. Always charge your battery
8. Which of the following devices can
leads to eye problem and skin
irritation
A. Keyboard
B. Mouse
C. Monitor
D. Printer
STRUCTURED QUESTION
1. Give five examples of ICT tools
2. Mention two health hazards or
effects associated with the use of
computer and mobile phone
3. Define the term health hazards.
4. Identify any five (5) possible health
hazards of prolonged use of
computing devices.
5. Suggest five (5) preventive
measures to reduce health and
safety risks associated with the use
of computers.
6. Identify any five measures to
reduce visual problems when using
a computer.
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STRAND 1
INTRODUCTION TO COMPUTING
SUB-STRAND 1
COMPONENTS OF COMPUTERS AND COMPUTER SYSTEMS
CONTENT STANDARD 1
PARTS OF A COMPUTER AND TECHNOLOGY TOOLS AND THEIR USES
Indicators
At the end of this content, learners will be able to:
Discuss the Fifth-generation computers
Demonstrate understanding of direct data entry devices
Examine the uses of the output devices: Braille printers, Impact, Inkjet, Thermal,
Wax, 3D printers
Describe storage devices: Flash Memory Storage Systems, USB Flash Drives, Solid
State Drives and Hybrid hard drives.
FIFTH-GENERATIONS OF COMPUTERS
The period of fifth generation started from 1980-till date. The process of developing
fifth generation of computers is still in the development stage.
This generation is based on parallel processing hardware and AI (Artificial
Intelligence) software. Two main characteristics can be identified with the fifthgeneration computers, which are:
Parallel Processing: Most computers today access and execute only one instruction
at a time. This is called serial processing. However, a computer using parallel
processing accesses several instructions at once and works on them at the same
time through the use of multiple central processing units.
Artificial Intelligence (AI): It refers to a series of related technologies that tries to
simulate and reproduce human behaviour, including thinking, speaking and
reasoning. AI comprises of a group of related technologies: expert systems (ES),
natural language processing (NLP), speech recognition, vision recognition, and
robotics.
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Features of Fifth Generation
1.
2.
3.
4.
5.
Development is based on artificial intelligence
Computers that are more portable and powerful.
Computers are dependable and less expensive.
Advancement in Parallel Processing
More user-friendly interfaces with multimedia features
Advantages of Fifth Generation of Computer
1.
2.
3.
4.
5.
These computers are far quicker than previous generations.
These computers are simpler to repair.
These computers are smaller in size than other generation computers.
They are lightweight and easy to move.
True artificial intelligence is being developed.
Disadvantages of Fifth Generation of Computers
1. Fear of Unemployment: Although AI offers numerous benefits, there are many
people who still fear about their job and think AI will replace their jobs in the
future.
2. Moden computers are simple but could be difficult to use
Quantum Computing
Quantum computing is an area of computer science that uses the principles of
quantum theory. Quantum theory explains the behavior of energy and material on
the atomic and subatomic levels.
Quantum computing uses subatomic particles, such as electrons or photons.
Quantum bits, or qubits, allow these particles to exist in more than one state (i.e., 1
and 0) at the same time. Where classical computers store information as bits with
either 0s or 1s, quantum computers use qubits. Qubits carry information in a
quantum state that engages 0 and 1 in a multidimensional way.
Google Sycamore is a quantum computer developed by Google AI Quantum. Google
Sycamore chip is based on a type of quantum computing called superconducting
qubits, which uses electric currents flowing through superconducting materials to
store and process information. Syca
processor comprising 54 qubits (quantum bits).
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DIRECT DATA ENTRY DEVICES
Direct data entry devices are devices that read data from the source and
transferred it directly to the computer system. They allow data to be sent into the
computer with no or little human interaction.
Direct data entry devices are specific purpose devices designed to automate or speed
up the entry of data in to the system by minimising human data entry. Examples include
Magnetic Stripe Reader, Chip and Pin Reader, Barcode Reader, Magnetic Ink Character
Recognition (MICR), Optical Mark Recognition, Radio Frequency Identification (RFID)
Readers and Graphic tablets,
1. Magnetic Strip Card Reader (MSCR)
Magnetic Strip Readers reads
information from magnetic stripes found on bank cards, membership cards and
hotel room doors.
strip reader. This is known as Swiping. The magnetic strip reader then sends data
from the card into the computer for processing.
The strip on the card holds information such as:
Bank account number
Name of card holder
Expiry date of membership
Uses of a Magnetic Strip Readers
1. ATM use these readers to process the information on bank cards
2. Electronic fund transfers point of sale (EFTPOS) uses the readers to transfer
3. Hotel rooms sometimes uses magnetic strip readers in place of door keys.
2. Chip and Pin Reader These allow people to pay for goods and services
electronically at EFTPOS terminals. The chip and pin
reader works by inserting a bank / credit card into a slot
and then entering a PIN (personal identification number).
If the correct PIN is entered, the cost of the goods or
transferred to the company (supermarket, restaurants
etc). The PIN ensures that the person with the bank card
is the genuine owner. Only the owner of the card should know the PIN.
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Uses of Chip and Pin Readers
They are used to make payments for goods or services in places such as:
Supermarkets
Filling station
Restaurants
Cafes
3. Barcode Scanners Used to rea
barcodes. The barcode scanner reads the information stored on the barcode
using a visible red light which is reflected and translated into digital information.
The barcode holds information about each
product including;
Product Id
Manufacturer
Country of origin
Note that the barcode does not store the price of the product. The price and other
information about the product are held in a computer database and access using
the product Id. The barcodes hold information about the product which is linked to
a computer database. This enables automatic fast billing to take place.
Once the barcode has been scanned, a computer can read the information stored
on the barcode and access details about the product that are stored in the database.
Uses of Barcode Scanners or Readers
a) Used in supermarkets, stores and warehouse where goods are marked with a
barcodes
b) They are used in libraries to scan library cards and read ISBN numbers on books
c) They are used to keep track of packages that are being delivered to different
locations
d) Also used in organising luggage in airports to ensure that luggage is loaded into
the correct plane
4. Optical Mark Reader (OMR) It is a device which automatically reads marks
made in pen or pencil. The OMR reader shines a light onto a form and less light is
reflected where a pencil mark has been made. This allows the reader to tell which
options has been chosen and send the result back onto the computer.
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Uses of Optical Mark Reader (OMR)
They are used to read the shaded areas of documents such as:
Multiple choice examination
Multiple choice questionnaire
Lottery tickets
5. Radio Frequency Identification (RFID) readers
RFID uses the same technology as contactless cards. They use radio waves to read
information that is stored on a tag. That information can be read from several
meters away. The tag is made up of two components, a microchip that stores and
processes the information, and an antenna that is used to receive and transmit the
information.
RFID tags are small tags that can be directly attached to a product and when a reader
passes within a certain proximity of the tag, the reader can read the contents of the
tag.
The tag itself can contain:
General Product information, such as its name and manufacturer.
Specific item information, such as its unique ID or
sold by date.
This means that a human (or robot) can pass by close to stock and the stock
information can be automatically read.
Some common uses for RFID applications include:
Pet and livestock tracking
Inventory management
Asset tracking and equipment tracking
Inventory control
Vehicle tracking
6. Graphic Tablet
A graphics tablet (also known as a digitizer, pen
tablet, drawing tablet or external drawing pad) is
a computer input device that enables a user to
hand-draw images, animations and graphics, with
a special pen-like stylus, similar to the way a
person draws images with a pencil and paper.
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Uses of Graphic Tablet
Teachers can project handwritten notes onto the board in the classroom
For writing Chinese, Japanese, and Korean characters
For creating computer graphics
Artists can create digital drawings or artwork with graphic tablet.
7. Quick Response (QR) code Reader
A QR code is a 2-D barcode that can be digitally read by
smartphones. QR codes contain information just like barcodes.
They can be used to make a call, send a message or email, or
even open a website. QR codes work similarly to barcodes, but
are able to hold much more information. They are scanned
usually via a mobile phone using its camera. The QR code can
take you to a website, it can play audio, it may hold information
for a company etc.
Uses of QR codes Reader
QR codes are used for many purposes. QR codes are commonly used for holding
data such as:
1. Payments - QR codes can store information about your bank account or credit
card.
2. 2-step verification passkeys - used during the configuration of two-step
authentication security by various websites and applications.
3. Links to apps 4. E-mail addresses - personal or business accounts
5. Addresses - personal home address, business address
Advantages of Direct Data Entry Device
1. Faster data entry process.
2. More accurate data entry.
3. Requires little or no human interaction.
Disadvantages of Direct Data Entry Device
1. They can be used for their intended purpose only.
2. Expensive to set-up (costs to buy the hardware / software).
3. Error may occur with faulty software or hardware.
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THE USE OF OUTPUT DEVICE
information. The information is ready to output or sent outside.
In this lesson, you will learn about different output devices such as Braille printers,
Impact, Inkjet, Thermal, Wax, 3D printers and their uses.
Impact Printer
Braille Printer
Inkjet Printer
3D Printer
Thermal Printer
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BRAILLE PRINTER
A braille printer (also called a braille embosser) is an impact printer that creates
tangible dots on a braille paper, making written documents readable to the visually
impaired individuals.
A Braille printer is a system that enables people who are blind to read using a sense
of touch. The utilization of the Braille printer allows individuals who are visually
impaired and blind to access information quickly and perform tasks that involve
reading and writing more efficiently using the Braille printer. In braille, each letter is
represented by a different dot pattern of up to six raised dots.
Benefits or Advantages of using braille
1. It enables the visually impaired to read.
2. Reading in the dark is possible.
3. Reading while stuck in traffic while keeping your eyes on the road.
Limitation or Disadvantages in using braille printers
1.
2.
3.
4.
They are slower.
They make a lot of noise.
It requires heavyweight paper.
Very expensive to use compared to other types of printers.
IMPACT PRINTERS
Impact printers form characters by striking on a print hammer or wheel against an
inked ribbon, leaving an image on a paper. There are two main types or category of
printers which are impact printers and non-impact printers.
Example of impact printer
1. Dot matrix printer
2. Daisy wheel printer
3. Band and chain printer
Characteristics of Impact Printers
1.
2.
3.
4.
They are less expensive
They make a lot of noise.
They are character or line printers (Prints character or line of text a time)
They produce low print quality
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Advantages and Disadvantages of impact Printers
Advantages
Disadvantages
Impact printers are less expensive
They are reliable printers
They are character or line printers
They use cartridges and ink ribbons.
Very useful for larger output prints
They produce low quality prints
They make a lot of noise while printing
They are very slow in printing
Refilling of the cartridge is expensive.
They are not able to print in colour
NON-IMPACT PRINTERS
Non-impact printer form characters and images without any direct physical contact
between the printing mechanism and the paper. Non-impact printers use laser,
spray of special ink or heat and pressure to print graphics and characters onto the
paper. The quality of print produced by a non-impact printer is higher than that of
the impact printer.
Examples of non- impact printers
1. Laser printer
3. Thermal printer
2. Ink-jet printer
4. Plotter
Characteristics of Non-Impact Printers
1.
2.
3.
4.
They are quiet in nature
They produce high quality print
They are expensive compared to impact printers
They are page printers.
Advantages and disadvantages of Non-Impact Printers
Advantages
Disadvantages
They require less maintenance than impact Non-impact printer ink cartridges are
printers.
extremely expensive.
They are very quiet in operation
Toner in laser printers is harmful to people.
They produce high quality print
They are easy to handle and move quickly.
The cost of replacing the ink cartridge is
high.
Inkjet printers are slower than laser
printers
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Thermal Printer
A thermal printer is a printer that makes use of heat in order to produce the image
on paper. Thermal printers use heated pins to "burn" images onto heat-sensitive
paper.
Thermal printers are increasingly becoming popular and are mostly used in airline,
banking, entertainment, retail, grocery, and healthcare industries. Thermal printing
does not make use of ink or toner unlike many other printing forms but largely
depends on thermal papers for producing the images.
Advantages of Thermal Printers
1.
2.
3.
4.
Thermal printer saves money, since there is no use of cartridge or toner.
More durable compared to other printers.
More efficient and fast in printing
Largely inexpensive and come in various models and sizes.
Disadvantages of Thermal Printer
1. Poor color printing compared to other printers
2. Printhead could be damaged by the high heat used while printing.
3. They consume more ink when the printhead becomes hot.
3D Printer
A 3D printer is a type of material design printer that designs and builds 3D models from
Computer Aided Design (CAD) using an additive manufacturing process.
3D printing is a process that uses computer-aided design, or CAD, to create objects layer
by layer. 3D printing is commonly used in manufacturing and automotive industries,
where tools and parts are made using 3D printers.
3D printing is an additive process whereby layers of material are built up to create a 3D
part. This is the opposite of subtractive manufacturing processes, where a final design
is cut from a larger block of material. As a result, 3D printing creates less material
wastage.
Uses or Application of 3D Printing
1.
2.
3.
4.
5.
6.
For creating product models and prototypes
For printing shoe designs
For creating wax casting for jewelry
Printing 3D foods.
For printing personal protective equipment (PPE)
For manufacturing replacement parts and spare parts.
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Advantages of 3D Printer
1.
2.
3.
4.
3D printers are affordable
Wastage is minimal during production.
3D printers are very fast in production
Environmentally friendly
Disadvantages of 3D Printers
1.
2.
3.
4.
3D Printers may not provide enough strength
May lead to high rate of unemployment
Limited material
Restricted Build Size.
Inkjet Printer
Inkjet Printer is a printer that blows ink onto paper using very small jets to produce
characters on the paper. Inkjet printers uses ink to print text, graphics, and images
onto various types of paper. They are mostly used in home and small offices.
Inkjet printer works by spraying droplets of ink onto a paper to from an image or
character. The ink is stored in disposable ink cartridges, and often a separate
cartridge is used for each of the major colours which are CMYK. CMYK stands for
Cyan, Magenta, Yellow, and Key. K' stands for Key, Key Color, or Key Plate, which
actually refers to the color Black.
Most inkjet printer can perform multiple functions like printing, scanning and
ed and black
& white.
Advantages of inkjet Printer
Good for photo and image printing
Disadvantages of Inkjet Printer
High maintenance cost
Cartridges can be refilled and reused.
Less printing speed compare to laser
printer.
Inkjet printers are smaller, lighter and Refiling and replacing of cartridges are
easier to maintain than laser printers.
very expensive.
Inkjet printers have a low start-up cost
Performance reduces with high volume
printing.
They are quieter in operation
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STORAGE DEVICE
In addition to the previously discussed types of storage device in basic 7, other
options are available for specific uses and applications. These include Flash Memory
Storage Systems, Embedded Flash Memory Cards and Readers, USB Flash Drives,
Solid State Drives and Hybrid hard drives.
Flash Memory Storage Systems
Flash Memory is a type of nonvolatile memory that can be erased electronically and
rewritten. Flash memory chips are a type of solid-state media, which means they
consist entirely of electronic components, such as integrated circuits, and contain
no moving parts. The lack of moving parts makes flash memory storage more
durable and shock resistant than other types of media such as magnetic hard disks
or optical discs. Types of flash memory storage include Memory Cards and Readers,
USB Flash Drives, Solid State Drives and Hybrid hard drives.
Memory Cards
Memory cards enable mobile users to easily transport digital photos, music, or files
to and from mobile devices and computers or other devices. Memory card is a
removable flash memory device, usually no bigger than 1.5 inches in height or width,
that you insert and remove from a slot in a computer, mobile device, or card
reader/writer.
Common types of memory cards include CompactFlash (CF), Secure Digital (SD),
Secure Digital High Capacity (SDHC), microSD, xD Picture Card, and Memory Stick.
CompactFlash
Memory Stick
Secure Digital
MicroSD
xD Picture Card
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USB Flash Drive
USB flash drive, sometimes called a thumb drive, is a flash
memory storage device that plugs in a USB port on a computer
or mobile device. USB flash drives are convenient for mobile
users because they are small and lightweight enough to be
transported on a keychain or in a pocket. With a USB flash drive,
users can easily transfer documents, photos, music, and videos
from one computer to another.
Solid-State Drive (SSD)
Soli-state drive or SSD drive, is a new type of storage device used in computers. It is
a non-volatile storage media that stores persistent data on solid-state flash memory.
SSDs replace traditional hard disk drives (HDDs) in computers and perform the same
basic functions as a hard drive. But SSDs are significantly faster in comparison. With
SSD, the device's operating system will boot up more rapidly, programs will load
quicker and files can be saved faster.
Features of Solid-state drive
1. SSDs are smaller as well as lighter in weight than previous hard drives.
2. The data transfer rate for SSD is between 100-500 Mbs / sec.
3. Solid-state drives have no moving parts.
4. SSDs are quiet in operation.
5. Solid-state drives consume less power or energy.
6. Solid-state drives are 25 to 100 time faster than hard disk drives.
Advantages of solid-state drives
1.
2.
3.
4.
5.
6.
Solid-state drives require less power to operate
They produce less noise because there is no moving or spinning parts.
They produce less heat since there are no moving parts
Quicker boot time and better performance.
Faster data access and transfer rate.
They are more resistance to accidental drop and shock.
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Disadvantages of Solid-state drives
1. They are more expensive than hard disk drive
2. SSDs have smaller storage capacity compare to Hard drives
3. SSDs decrease in performance over time.
4. Data recovery process is time-consuming and can be expensive, as the data
on damaged chips may not be recoverable.
Property
Comparison between SSD and HDD
Solid-State Drive (SSD)
Hard Disk Drive (HDD)
Heat
Less heat production
More heat production due to
moving parts
Electricity
Consumes less power
Consumes more power due to
moving parts
Noise
Produce less or no noise
Moving parts make a lot of noise.
component
SSD has no moving components
HDD structure has moving parts
Weight
Less in weight
Heavy in weight
Speed
SSD has faster read/write
operation than HDD
HDD has longer read/write
operation
Hybrid Hard Drive
Hybrid hard drive also known as Solid State Hybrid Drive (SSHD) is a storage drive
that combines the best features of a hard disk drive (HDD) and solid-state drive
(SSD).
Hybrid is defined as something which is a combination of two different things and
so is a Hybrid hard drive as it is a combination of hard disk and solid-state drive. Its
intended purpose is to bring together the performance of an SSD and high capacity
of an HDD.
SSD provides great speed and performance but it is not very good when it comes to
capacity and internal storage. While in hard disk, it provides a larger capacity and
storage than SSD but is not very efficient when it comes to speed and performance.
SSHD combines the speed of SSD and capacity of HDD and comes at a very affordable
price for users.
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CONTENT STANDARD 2
Demonstrate the use of the Desktop features.
Indicators
At the end of this content, learners will be able to:
Explore the use of the Charms bar
Practise file management techniques (Drive Management)
WINDOWS CHARMS BAR
The Charms bar is a systems toolbar available in Windows 8 Graphical User Interface
or screen. The Charms bar is a vertical toolbar, found on the right-hand side of the
screen, and includes search, share, start, devices and settings icons or buttons. The
menu appears when the mouse cursor is positioned at the top-right or bottom-right
corner of the Windows 8 GUI.
Search
Share
Start
Device
Settings
Search: To find and open any program or file. (Window Key + F)
Start: Open the Windows 8 Start menu. (Windows Key)
Share: Share and send links, photos, and more to your friends and social networks
in the app currently open. (Windows + H)
Devices: List available devices, for example printer or keyboard. (Windows + K)
Settings: View Start Settings, view settings such as battery monitor, volume,
brightness, notifications, and the power to shut down the computer. (Window + I)
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FILE MANAGEMENT TECHNIQUES (DRIVE MANAGEMENT)
Drive or disk management is a utility software or tool used to manage data on disk
by performing various functions on it. It enables users to view and manage the disk
drives installed in their computer and the partitions associated with those drives.
Some basic functions that disk management utility tools performs includes:
Disk partitioning
Disk defragmentation
File compression
Defragmentation
Defragmentation, also known as defragging or defrag, is the process of rearranging
the data on a storage medium, such as a hard disk drive (HDD), for efficient storage
and access. Defragmenting is the process of scanning your hard drive and joining the
different file fragments stored on the disk. Defragmentation increases the speed
and performance of a hard disk.
How to perform a disk defragment on windows 10
1. Select the search bar on the taskbar and enter defrag.
2. Select Defragment and Optimize Drives.
3. Select the disk drive you want to optimize or defragment.
4. Select the Optimize button.
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Disk Partitioning
Disk Partitioning is the process of dividing a disk into one or more regions
called partitions. Disk partition, is a logical division on a hard disk drive (HDD) that
enables a PC to have different drives. A partition divides the hard drive into several
logical storage units on one drive but functions as multiple drives.
Reasons or importance of disk partition
1.
2.
3.
4.
For better data organisation on your PC
Run different operating systems on one PC
Partitions make data recovery convenient and efficient.
Windows can easily be reinstalled without affecting the installed programs.
Partition a Hard Drive with Disk Management on Windows 10/11
1. Right-click the Windows icon, then click Disk Management.
2. Right-click the hard disk partition that you want to shrink, and select "Shrink
Volume.
3. Enter the amount of space you want to shrink in MB, then click on the "Shrink"
button. Wait for the process to complete, you'll get an unallocated volume.
4. Right-click on the unallocated space on your hard disk, and then select "New
Simple Volume".
5. In the New Simple Volume Wizard interface, click "Next".
6. Enter the size of the volume you want to create in MB or accept the default
size, and then select "Next".
7. Accept the default drive letter or choose a different letter for the partition, and
then select "Next".
8. Set the default file system as NTFS and click "Next" to format the volume.
9. Click "Finish" to complete creating a new partition in Windows 11/10.
File compression
File compression is the process of reducing or squeezing the size of files to save
storage space. File compression is the act of reducing the size of data while
maintaining the integrity of the information. This is useful because it allows us to
store smaller files on storage disks, as well as making file transfer over the internet
more efficient.
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ASSESSMENT QUESTIONS
MULTIPLE CHOICE
A. Device
B. Search
C. Toolbar
9. Dividing a hard disk into one or more
regions is called?
A. Compression
B. Partition
C. Defragmentation
1. Which generation of computers uses
parallel processing and artificial
intelligence?
A. Third generation
B. Fourth generation
C. Fifth generation
2. When a computer is able to process or
execute more than one instruction at a
time, it refers to as
A. Serial processing
B. Parallel processing
C. Multi-processing
2. Which of the following device can be
used to mark multiple choice
examination?
A. Chip and Pin Reader
B. Optical Mark Reader
C. Barcode Reader
3. The best printer for the visually
impaired or blind people is
A. Laser printer
B. Thermal printer
C. Braille printer
4. Which of the following is not an
example of non- impact printer?
A. Dot Matrix
B. Plotter
C. Thermal printer
10. The process of reducing the size of
files to reduced storage space is
known as
A. Compression
B. Partition
C. Defragmentation
STRUCTURED QUESTION
1. Explain the term direct data entry
device and give four examples
2. State three (3) uses of barcode
reader.
3. What are the advantages and
disadvantages of direct data entry
device.
4. Explain the following and give 2
examples each.
I. Impact printer
II. Non-Impact printer
5. State 3 applications of 3D printer
6. identify any three advantages of
SSD over HDD
7. Explain the following terms
i. Defragmentation
ii. File compression
iii. Disk partition
7. Another name for USB flash drive is
A. Memory card
B. thumb drive
C. Memory stick
8. All the following are features of the
windows charm bar except
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SUB-STRAND 2
TECHNOLOGY IN THE COMMUNITY
CONTENT STANDARD
DEMONSTRATE THE USE OF TECHNOLOGY IN THE COMMUNITY
Indicators
At the end of this content, learners will be able to:
Discuss technologies that help to improve computer accessibility
Describe how portable computing devices affect our everyday lives
Explain the issues associated with online services (e.g. social media, wikis, blogs, etc.)
ADAPTIVE AND ASSISTIVE TECHNOLOGIES
Many people have disabilities that limits their ability to perform daily living tasks.
Low vision and mobility issues, as well as speech and hearing problems, can seriously
affect a person's ability to navigate daily life.
Assistive and adaptive technologies can help people
their limitations. Although the terms are often used interchangeably, there is a slight
difference in the definitions of assistive technology and adaptive technology
Both assistive and adaptive equipment refer to devices and technology that help
people live more independent. Assistive and adaptive equipment help improve
people's mobility, communication, and sensory abilities.
Assistive equipment or technology
This includes devices and technology that allow people with disabilities or aged
person to participate in daily life with greater ease. Assistive technology can be
bought off-the-shelf, modified, or custom-made.
Adaptive equipment or technology
Adaptive technology is a subset of assistive technology, which refers to
something specifically designed for people with disabilities. Adaptive equipment has
been modified or enhanced from its original purpose to specifically meet the needs
of a person with a disability. Adaptive equipment is more specialized.
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Category of people with disability
People with disability can be categorize into different group, which includes;
1.
2.
3.
4.
5.
Sensory Disability (blindness or vision impaired and deaf or hearing impaired)
Locomotive or mobility disability (including cerebral palsy and leprosy)
Mental Disability
Intellectual disability
Learning disability
Technologies that can be used to help people with special need.
The following are both adaptive and assistive equipment and technology that can
be used to help or assist people with disabilities.
Large monitors
Software to adjust screen colors
Computers with voice output
Computers with visual output
Screen readers
Text-to-speech software
Braille embossers
Screen enlargement applications,
On-screen keyboards
Electronic pointing devices
Joysticks
Trackballs
PORTABLE COMPUTING DEVICE IN OUR EVERYDAY LIFE
Portable computing devices have affected our everyday life in both positive and
negative ways. With the increase in usage of mobile devices such as smartphones,
laptops, smart watches, and GPS, access to information and communication has
never been more easily accessible.
You can have music in your pocket and make life more enjoyable. you can keep up
with people the latest trends, the latest sports, whatever you want. you don't need
to see your friends you can text them when you are not able to hang out with them.
How These Devices Affect Our Daily Lives.
Mobile Phone
Smartphones have transformed the world in how people communicate with each
other. With the world's population of about seven billion people, there are over 2.5
billion smartphone users worldwide.
The most fundamental function of mobile phone is to receive and make calls. It also
allows us to tell the time, take pictures, get directions, entertain ourselves,
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communicate with people on the various social media platforms and many more.
These small devices are everywhere and have an increasing role in the lives of
everyone.
Effects of using mobile or smart phone
Positive Effects
Negative Effects
1. Help people stay connected
2. Helps people to communicate with
each other
3. Help businesses run smoother
4. Really useful in emergencies
5. Many different opportunities to learn
6. Creates jobs in the technology world
1. Affects student's studies
2. Distracted driving due to cellphones
is becoming a big problem
3. The
radiation
of
cellphones
negatively affects our health
4. Blue light emitted from phone
screens affects our vision
Smart watches
Smart watch is a wearable computing device that look like a wristwatch or other
time-keeping device. Smart watches have many features that smartphones have,
but it is much more compact.
In addition to telling time, many smartwatches are capable of extending the
capabilities of th
smartphone to the watch through Bluetooth transmission.
The user can use the watch's interface to initiate and answer phone calls from their
mobile phone, read email and text messages, get weather reports, listen to music,
access GPS location and health data.
Useful features of smartwatches
1. Health information, such as heart rate, blood oxygen level, blood pressure and
temperature monitoring;
2. Messaging and calling features, similar to those on a smartphone.
3. Emergency calls for assistance if the watch detects the user has fallen.
4. Location features, such as maps, a compass and GPS tracking.
Laptop
Laptops are very common in the modern-day society. Like smartphones, they are
lightweight, portable, and can be used on the go. Laptops allow us to feel like we
are working on a desktop but with the convenience of being able to work wherever
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and whenever we want. They also consume eighty percent less electricity than
desktop computers being particularly beneficial for students and businessmen.
People use laptops on a daily basis as they provide many advantages over desktops
and smartphones.
PDA
PDA is short for personal digital assistant, and it is a handheld device that combines
computing, telephone, Internet and networking features. A typical PDA can function
as a cellular phone, fax sender, Web browser and personal organizer. PDAs may also
be referred to as a palmtop, hand-held computer or pocket computer. Basically,
what a PDA does is to combined the features of a laptop and a cell phone on same
device.
GPS
Global Positioning System (GPS) has made the lives of many people safer by reliably
transmitting maps to unfamiliar locations through portable GPS navigational devices
that speak to the user rather than requiring the user to read a map. These devices
can save a great deal of time and fuel costs by preventing a user or driver from
becoming lost in an unfamiliar location.
For people who are traveling alone, GPS technology can direct them to the exact
location or to a specific address without any assistance from anyone.
ISSUES ASSOCIATED WITH ONLINE SERVICES
The internet has transformed the lives of students in many ways. From online classes
to virtual study groups, the internet provides many resources that allow learners to
manage their day-to-day activities more efficiently. Also, social media provides
students with a platform to connect and collaborate with peers, allowing them to
form study groups in the comfort of their homes.
An online service is an entity that provides access to various types of data for
different uses via the Internet. Examples of online services include online banking,
educational, news, shopping, blogs, e-mail, wikis and social media networks.
Issues Associated with Online Service Delivery.
Every day, regardless of your age or the website you use, you are at risk of being
hacked and having your information stolen. It might be your accounts on social
networking sites, bank websites, or even information on your personal computer.
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Example of these issues include
Reliability of passwords
Network Security
Identity Theft
Reliability of Password
Passwords are hard to choose, especially choosing the right one that is easy to
remember for yourself yet hard to guess by others. Many people tend to use very
easy passwords for many of their accounts because they find it much easier to
remember. These simple passwords can put their computer or mobile device at risk,
and allow for hackers to access their financial and personal information.
Here is a list of some of the world's most popular passwords that are very easy to
be hacked:
1. Password
2. Password1
3. 123456
Security experts suggest that people use a different password for each service or
website they have an account with. For this way if one of your accounts is hacked,
the others will remain safe. The way to create a password that will be hard for others
to guess is by using characters that nobody could think of. Your password should
contain UPPERCASE and lowercase letters, numbers and symbols.
Network Security
Network security are software and hardware that protects you from threats.
Components of Network Security include:
Anti-virus and anti-spyware
Firewall, blocks unauthorized access to your network
Virtual Private Networks (VPN), to provide secure network access.
Identity Theft
Identity theft can also be known as identity fraud, which is a crime in which an
imposter obtains key pieces of personally identifiable information, such as Social
Security or account details, in order to impersonate someone else for financial or
legal purposes. Some of the ways that identity can be stolen are listed below:
Stealing your mail.
Looking for personal documents in your trash.
Tampering with ATMs to steal your banking information.
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SUB-STRAND 3
HEALTH AND SAFETY IN THE USE OF ICT TOOLS
CONTENT STANDARD
DEMONSTRATE HOW TO APPLY HEALTH AND SAFETY MEASURES IN USING ICT TOOLS
Indicators
At the end of this content, learners will be able to:
Discuss health issues at workstations
Discuss safety measures in risk reduction at workstations
HEALTH ISSUES AT WORKSTATIONS
Individuals who use computers for long periods of time may experience discomfort
or pain as a result of poor posture, improper adjustment or use of workstation
components and other factors. In most cases, there are relatively simple and
inexpensive corrective measures which can be employed to reduce the likelihood of
discomfort or injury. Companies must put measures in place or train computer users
on how to adjust their computer workstations in order to work safely. We will
discuss the importance of taking regular break, adopting good sitting posture and
using document holders as a safety measure at the workstation.
The Importance of Taking Regular Breaks from Bulk Work
Continuously working without taking proper breaks is affecting not just your
productivity but also your mental and physical health and your overall wellbeing.
There are plenty of different activities that constitute breaks, here are some
examples:
A casual conversation with co-workers
Checking your phone and/or social media for non-work content
Taking a walk outside or around the office
Having a snack or meal
Here are some of the significant benefits of taking frequent breaks:
1.
2.
3.
4.
5.
Breaks help to prevent and reduce stress.
Breaks help to improve your physical health.
Breaks improve your memory and learning.
Breaks improve your mental health and overall wellbeing.
Breaks increases your productivity.
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Adopting a good posture position at work
Posture is the position of your body when you are standing or sitting. It describes
how your spine is aligned with your head, shoulders, and hips. Good posture is an
essential part of staying healthy, and fit. It helps you to maintain proper alignment
of your spine, shoulders and hips. To prevent chronic health issues and enhance
your wellbeing, it is important to implement healthy workplace habits that improve
your posture at work and anywhere you find yourself.
the right amount of support from muscle tension. The following guidelines can help
improve your sitting posture.
Proper Sitting Posture
1. Sit with a back straight (no hunching), your shoulders pulled back and buttock
touching the end of the seat.
2. Keep your neck and head in an upright angle with your ears aligned with your
shoulders.
3. Avoid leaning on any side. Keep hips even to distribute weight of body.
4. Bend your knees at a 90-degree angle, and keep your knees even with or
slightly lower than hips.
5. Leave a 2 3-inch small gap between the bottom of your thighs and the edge of
the seat. This helps reduce pressure build up in the underside of your thighs.
6.
7.
8. Avoid sitting for longer than 30 minutes at a time.
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Sitting Positions That Must be Avoided
Use of document holders at workstation
A document holder is a tool that allows you to position a physical document you are
working on while at a computer in order to reduce risk of occupational fatigue,
headaches, neck pain and eye strain.
Almost everybody who use computers on a daily
basis at least occasionally have tasks that involve
referring to a hard copy document while typing. In
those times and when properly used, a welldesigned document holder can be greatly impactful
ergonomically.
Benefits of using documents holder
A document holder helps to avoid ergonomic hazards which include:
1. Neck twisting
2. Unnecessary eye fatigue and headaches
3. Curved spine
Safety measures to reduce risk at workstations
Refer to page 62 for the measures to reduce risks at workstation
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ASSESSMENT TASKS
MULTIPLE CHOICE
1. Which of the following is classified as
sensory impairment or disability
A. Mental illness
B. Leprosy
C. Blindness
2. Cerebral palsy belongs to which
category of disabilities?
A. Sensory disability
B. Locomotive disability
C. Learning disability
3. Braille embossers or printers are
STRUCTURED QUESTIONS
1. Briefly explain the following terms;
i. Adaptive technology
ii. Assistive Technology
2. Identify any three devices that can be
used to assist someone who is
visually impaired or blind to use a
computing device
3. State four ways in which mobile
phone affects our daily life.
4. Mention any three uses or
applications of smart watches
5. What are the major issues associated
in online services
6. Write the Following abbreviation in
full
i. PDA
ii. GPS
iii. VPN
7. Identify any four safety measures to
reduce back pains at the workplace.
8. State four (4) ways to reduce eye
problem when using the computer.
9. How can you reduce wrist pains when
using the computer.
10. As a student, what are some of the
effects of playing computer game for
long hours
11. State three benefits of using
document holder.
12. Identify any three importance of
taking regular breaks at the
workplace
A. Hearing impairment
B. Vision impairment
C. Learning impairment
4. Computers with voice output is best
A. Hearing impairment
B. Vision impairment
C. Voice impairment
5. All the following are positive impact of
mobile phone except
A. For communication
B. For entertainment
C. Distracted driving
6. Which of the following is not a safety
measure to consider in ICT
environment?
A.
B.
C.
D.
Not overloading the socket
Proper sitting position
Avoid using damage socket
Always charge your battery
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STRAND 1
INTRODUCTION TO COMPUTING
SUB-STRAND 1
COMPONENTS OF COMPUTERS AND COMPUTER SYSTEMS
CONTENT STANDARD 1
PARTS OF A COMPUTER AND TECHNOLOGY TOOLS AND THEIR USES
Indicators
At the end of this content, learners will be able to:
Discuss the trends in the next generation of computers.
Examine the concept of Perceptual Computing.
Discuss the uses of Output devices such as Wearable Displays, E-Paper, E-Books, Kindle
Describe Storage Systems: Network and Cloud Storage Systems, Smart Cards,
Holographic Storage, Storage Systems for Large Computer Systems
TRENDS IN THE NEXT GENERATION OF COMPUTERS
Computers are found in every aspect of our daily lives, and this digital
transformation is creating a trend of new business models and innovations. As the
number of application usage increases, so too do the demands we place on software
and hardware.
The key trends of next-generation computing are computers and digitization. In the
coming decades, the digital world will experience immense technological
advancement. But, why is it important for you to know? Having certain knowledge
about the upcoming development will help prevent various shocks. The
development can either be good or bad for businesses and the society as a whole.
However, it is upon you to take advantage of it and get the best benefit out of it.
Features expected to be seen in the next generation of computers include:
1. Neuromorphic Computing: Neuromorphic computing uses the human brain as a
model for hardware and computing platforms, semiconductor technologies, chip
design, architectures and algorithms in order to increase the performance and
energy efficiency of computing systems, including mobile and edge applications.
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2. Quantum Computers: Quantum computers can tackle highly complex
calculations that would be almost impossible to perform even with conventional
supercomputers. This makes the development of corresponding technologies and
algorithms essential for the next generation of computers.
3. Artificial Intelligence: There is no doubt that artificial intelligence will be one of
the biggest trends. We are still in the initial phase of development in artificial
intelligence. With modern technology, companies are focusing on integrating AI
with various technological tools. Along with that, speech generation with AI will
improve the interaction between humans and computers.
4. Facial Recognition and Computer Vision: Artificial intelligence is promoting
computers to interact with humans. But in the upcoming years, we expect these
machines to see as well. This feature is also available in various security systems
and mobile phones. Hence, this section will improve more in the future with rapid
development.
5. Increased Connectivity: Improvement in digital connections with 5G connectivity
will improve economic structure significantly. Also, the increase in wireless
control of machines and mobile tools can cause a drastic shift in digitalization.
Quantum Computing
Quantum computing is an area of computer science that uses the principles of
quantum theory. Quantum theory explains the behavior of energy and material on
the atomic and subatomic levels.
Quantum computing uses subatomic particles, such as electrons or photons.
Quantum bits, or qubits, allow these particles to exist in more than one state (i.e., 1
and 0) at the same time. Where classical computers store information as bits with
either 0s or 1s, quantum computers use qubits. Qubits carry information in a
quantum state that engages 0 and 1 in a multidimensional way.
Google Sycamore is a quantum computer developed by Google AI Quantum. Google
Sycamore chip is based on a type of quantum computing called superconducting
qubits, which uses electric currents flowing through superconducting materials to
store and process information.
Sycamore
(quantum bits). Sycamore achieved its results using exactly 53 qubits.
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PERCEPTUAL COMPUTING
Perceptual computing maybe defined as a technology advancement in which
computers are able to sense or analyze the environment around them and respond
accordingly.
In simple terms, perceptual computing is the ability for a computer to recognize
what is going on around it. The computer then can determine what user might need,
as well as react to those needs without giving or receiving any additional information
from the user.
Passwords are no longer needed. When your computer is able to recognize you,
there is no need for a password. You are your password with perceptual computing.
computer can guess at a how a person is feeling. With this technology the computer
can tell that a person is getting happy, angry or sad and respond accordingly.
Features of perceptual computing includes;
1.
2.
3.
4.
5.
6.
Speech and Voice Recognition
Controlling application using gestures
Hand, Finger and Head tracking
Gesture and pose recognition
Face tracking and recognition
Emotion detection
Uses of Output devices such as Wearable Displays, E-Paper,
and E-Books
Wearable Display
Wearable device is any kind of electronic device designed to be worn on the user's
body. Such devices can take many different forms, including glasses, jewelry,
accessories, medical devices, and clothing or elements of clothing.
A wearable computer is a technology tool that a customer can wear usually to
monitor health and fitness-related information.
The most common examples of wearable technology include smart watches, (AI)
hearing aids, Google Glass, Apple Glass and Microsoft's HoloLens
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Google Glass
Google Glass is a wearable, voice- and motion-controlled Android device that
resembles a pair of eyeglasses and displays information directly in the user's field of
vision. Google Glass offers an
augmented reality (AR) experience
by using visual, audio and locationbased inputs to provide relevant
information to users.
The glasses have built-in Wi-Fi and Bluetooth connectivity and a camera for taking
photographs and videos.
Uses of Google Glasses
1. For taking photos and videos and then share them through Google Hangouts.
2. Searching for information on the internet through the glasses, using Wi-Fi or a
smartphone's data connection.
3. For both voice and video calls.
4. Responding to emails and text messages using voice dictation.
5. It provides step-by-step directions with a map displayed on the screen.
E-Paper (Electronic Paper)
Electronic paper or e-paper is a technology that makes it
easy to read text on an electronic gadget. It is a display
technology that mimics the appearance of ordinary ink on
paper to produce a low-power, paper-like display. E-paper
display does not need electricity to sustain the displayed
text and image.
The displays can hold static text and images for months
without electricity. That is, it can retain text and images even when power is off.
Advantages of E-Paper Display
1.
2.
3.
4.
Consumes less power
Display stays for a long time without power
It is available in multiple sizes
It is a high-definition and paper-like appearance display
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Disadvantages of E-Paper Display
1.
2.
3.
4.
Display is slow to update
Not suitable for animation or fast-changing displays
It is expensive as compared to LCD and other similar size displays.
It has less memory
E-Book (Electronic Book)
An e-book, short for electronic book, is a digital form of a printed book designed to
be read on devices like computers, tablets, or smartphones. It is a non-editable text
that is converted into a digital format and read on an electronic device.
E-Book Reader
An e-reader, also called an e-book reader or e-book device, is a device that is
specially designed for reading electronic books. It is an electronic version of a
physical book that can be read on a screen or a handheld device specifically designed
for reading (known as e-book reader).
Kindle is the first portable hardware computer released in the U.S. for reading ebooks by Amazon.
Any device that can display text on a screen may act as an e-reader; however,
specialized e-reader devices may improve portability, readability, and battery life for
this purpose.
Examples of E-Reader Apps or software
Examples of e-book readers
1.
2.
3.
4.
5.
6.
1.
2.
3.
4.
5.
6.
7.
Amazon Kindle
Sony reader
Kobo
Barnes and Noble Nook
Tablet
Smart Phones
Advantages of Using E-Books
1.
2.
3.
4.
5.
Amazon kindle app
Kobo books
Apple books
Adobe Reader
epub reader
Wattpad
OverDrive
E-books are portable.
E-books are affordable compare to printed books.
E-books are environmentally friendly. No cutting of trees to produce papers.
Unlimited access to books anytime anywhere.
E-book saves space, with all books on one device.
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Disadvantages of using E-Books
1. Piracy is the number one concern for both publishers and authors of e-book.
2. There are health issues while reading during night time mostly on tablets.
3. E-books require power source. As a result, if battery is not charged and power
source is not available, reader cannot have access their e-books.
STORAGE SYSTEMS
Storage System holds data, instructions, and information for future use. Every
computer system store system software, application software and user files. As we
have already discussed the various storage devices and their uses in basic 7 and 8,
we will look at other types of storage systems such as cloud storage, smart cards,
holographic storage and server storage systems in this section.
Cloud Storage
Cloud storage is the technology of saving data in a remote physical location that can
be accessed through the Internet from any device. Cloud storage is an Internet
service that provides storage to computer users.
Types of services offered by cloud storage providers vary. Some provide storage for
specific types of files, such as photos or e-mail messages, whereas others store any
type of file.
Examples of Common Cloud Storage (Cloud Storage Providers)
1.
2.
3.
4.
5.
Google Drive
One Drive
Dropbox
iCloud
Amazon cloud drive
Most of the storage providers provide free storage space and extra storage at a fee
with monthly subscription.
Advantages (Pros) of Using Cloud Storage
1.
2.
3.
4.
5.
Backup your data to the cloud
No more external hard drive is needed.
Remotely update and sync your files
Keep your files encrypted
Stores your data for a lifetime.
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Disadvantages (Cons) of Using Cloud Storage
1. You need an internet connection to access your data.
2. Extra storage space comes at a cost.
3. Security and privacy concerns with some providers.
Smart Cards
Smart card is a plastic card with a built-in microprocessor, used typically to perform
financial transactions. A smart card is a card that is embedded with either a
microprocessor and a memory chip or only a memory chip. The microprocessor card
can add, delete, and otherwise manipulate information on the card, while a
memory-chip card (for example, pre-paid cards) can only undertake a pre-defined
operation.
Smart card can be used to store and process information and to control access,
either to a physical location or to data.
Examples of Smart Cards Includes:
1.
2.
3.
4.
5.
ATM cards (debit and credit cards)
ID cards (Ghana card and SSNIT card)
Passports
SIM cards
Pre-paid cards
Uses or Application of Smart Cards
1.
2.
3.
4.
5.
6.
Banking & Retail
Healthcare
Transportation.
ID verification and access control
Mobile communications
Computer and network security
Holographic Storage
Holographic Storage It is a computer storage device that uses beams of light to store
three-dimensional digitally created data.
Holography is the use of light, typically two distinct beams of light or energy, to
rough the
use of light at a later time. Holographic storage can access the bits of data in a
parallel manner, through the beam of light, rather than one bit at a time, making
data recording and retrieval significantly faster than other media.
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CONTENT STANDARD 2
DEMONSTRATE THE USE OF THE DESKTOP
Indicators
At the end of this content, learners will be able to:
1. Explore personalisation of the computer
2. Identify and use file management techniques (drivers and hardware)
DESKTOP PERSONALISATION
Personalization is the process by which a user customizes a desktop, or interface to
suit personal preferences. It is always nice to personalize your computer to make it
work best for you. Here are some ways to personalize Windows 10:
1.
2.
3.
4.
5.
Change the desktop background
Change the desktop icon
Change the mouse pointer
Customize the taskbar
Change the accent colour and theme
How to Change Desktop Icon
If you are bored with the default icons on your Windows 10 computer, you can use
the following ways to change desktop icons easily.
1. Change Desktop Icons on Windows 10
2. Change Folder Icons on Windows 10
To change the desktop icon:
1. Right-click on desktop and select Personalize.
2. Click on Themes at the left pane of the window.
3. At the right pane, locate Related Settings and click on Desktop Icon Settings
4. In the Desktop Icon Settings window, select the desktop icon you want to
change and click Change Icon.
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5. Choose a new icon from the list or
click Browse to input an icon and
tap OK.
6. Click on Apply and then Ok
To change Folder Icon:
1. Right-click the folder and select Properties in the context menu.
2. Choose Customize and click Change Icon in the Properties window.
3. Choose a new icon from the list or click Browse to input an icon and tap OK.
4. Click on Apply and then Ok
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How to Change the Mouse Pointer
1. Right-click on the desktop
and select Properties
2. Click on Themes at the left
pane of the window.
3. Locate and select Mouse
Cursor at right pane of the
window.
4. In the Mouse Properties
dialog, select the Pointers
tab,
5. Select your desired mouse
pointer size and color from
the drop-down list under
Scheme.
6. Click Apply and then Ok to
apply the changes.
To change the mouse pointer's size and color back to its default state, just click the
Use Default button.
FILE MANAGEMENT TECHNIQUES (DRIVERS AND HARDWARE)
A device driver is a special kind of software program that controls a specific
hardware device attached to a computer.
Device drivers are system programs responsible for proper functioning of devices.
Every device, whether it is a printer, monitor, mouse or keyboard, has a driver
program associated with it for its proper functioning. Whenever a new device is
added to the computer system, a new device driver must be installed before the
device is used.
Types of Device Driver
Drivers can be broadly classified into two types. These are:
1. Kernel-mode Device Driver
2. User-mode Device Driver
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Kernel-mode Device Driver: Kernel-mode device driver includes some basic
hardware that loads with an operating system as part of the OS. These are BIOS,
motherboard, processor, RAM and some other hardware that are part of the
operating system.
User-mode Device Driver: They refer to device drivers that users may install and
use on their system. When using a system, users may have their own external
devices that they bring to use, such as mouse, keyboard, sound card, printer and
mobile phones. These devices also require drivers to function.
Common Device Drivers and Their Functions
1. Sound Drivers - Audio driver is the software that helps your operating system to
communicate with audio devices such as internal sound cards, speakers,
headsets, and microphones.
2. Graphic Drivers - The software that links the operating system to a particular
graphics card. Aside higher resolution graphics, graphics driver can also speed up
your PC and boost your computer's performance, not only for gaming but for any
multimedia application.
3. Network (LAN) Drivers - A network driver is a software program that controls a
device used to connect a computer to a network.
Plug-and-Paly Device
Plug and play (PnP) refers to a computer's ability to detect and configure hardware
automatically without requiring the user to install any device drivers.
Drivers are required for plug and play devices to work, but they are automatically
installed when the device connects to a computer. The operating system detects the
device and installs the necessary drivers. There is no need to manually install
separate drivers for a plug and play device.
Examples of plug and play devices
There are many different plug and play devices available for computers. Below is a
list of common ones.
1. External hard drive
2. Gamepad or joystick
3. Keyboard
4. Mouse
5. USB flash drive
6. Webcam
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How to Install, Update and Delete Drivers
Driver installation or updates for devices, such as network adapters, monitors,
printers, and video cards, are automatically downloaded and installed through
Windows Update. But if you want to manually install, update or reinstall (delete) a
driver, here is how to do it.
To Install, Update or Delete (uninstall) Driers on windows 10:
1. Right-click on the Start menu
2. Locate and select Device Manager
3. Search through the
devices and double-click
on the device that you
want to update or delete
drivers from the Device
Manager dialog box. This
will load the drivers
below the device name.
4. Select any of the options from the pop-up
menu to update, disable or uninstall the
selected drivers.
5. To update drivers, select Search
automatically for drivers or Browse my
computer for drivers
Note: Some drivers may require you to restart your computer after an
installation, update or uninstallation of drivers.
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SUB-STRAND 2
TECHNOLOGY INT HE COMMUNITY (COMMUNICATION)
CONTENT STANDARD
Demonstrate the Use of Technology in the Community
Indicators
At the end of this content, learners will be able to:
Evaluate problems in the community that can be solved with technology
Propose solutions to the problems identified
Design the solution selected
ACTIVITY
Task in this content is to be done as a project work
Activity 1: Problems in the community that can be solved with technology
Students are to discuss problems in the community that can be solved using
technology. Work in pairs.
Activity 2: Propose solutions to the problems identified.
Present technological solutions to the problems identified in activity 1
Activity 3: Design the solution selected.
Design the solution selected.
Present the solution designed to class.
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SUB-STRAND 3
HEALTH AND SAFETY IN THE USE OF ICT TOOLS
Demonstrate
CONTENT STANDARD
How to Apply Health and Safety Measures in the
Use ICT Tools
Indicators
At the end of this content, learners will be able to:
Evaluate health issues at workstations
Evaluate Safety Risk Reduction at issues at workstations
HEALTH ISSUES AT WORKSTATIONS
Ergonomics refers to the process of arranging a workplace, systems, and equipment
in a way that makes it easy safe for people to use them.
Ergonomic workstation is one that supports your body in a neutral position and can
reduce the risk of discomfort or pain cause to our bodies. To reduce risks and injuries
at workplace, workstations should be design with ergonomic tools or equipment.
Ergonomics workstation setup
There is a wide variety of ergonomically designed equipment available, including
chairs, adjustable-height desks, monitor arms, alternative mouse devices,
keyboards, document holders, headsets, and anti-fatigue mats.
Chair
Chairs selected should meet the following requirements:
1.
2.
3.
4.
Easy-to-use control mechanisms
5-point base to prevent tipping or slipping
Castors for carpet; braked castors for hard surfaces
Fully adjustable to accommodate different size
workers
5. Conform to the lower back curve of the user
6. No arms, or if necessary, arms must be adjustable in
height and direction so that they do not prevent you
from getting as close to the desk as possible.
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Keyboard
1. Place directly in front of the body to avoid twisting the neck or torso
2. Position yourself in front of the computer monitor with the letters G and H
approximately in line with your navel. This is particularly good positioning when
doing a lot of keyboard work
3. Position yourself so that you can reach the keyboard with your elbows in a
neutral position by the side of the body
4. Arms should be parallel to the floor when fingers are placed gently on the
keyboard. The seated elbow height should be a little higher than the height of
the keyboard. Raise or lower your chair to achieve this position
Mouse
wrist and forearm muscles. Ensure the mouse is not too large so that the wrist is in
a neutral position during use.
1.
2.
3.
4.
Take the hand off the mouse at frequent intervals
Use keyboard shortcuts where possible.
Position the mouse directly to the right or left-hand side of the keyboard
Mouse operation can alternate from left-handed to right-handed to minimize
strain on one hand.
Laptop
Laptops are not designed to be used for long periods. The
monitor and keyboard are so close together that they
cannot both, be in good positions at the same time. If you
are using a laptop for long periods, it is best to add a
separate monitor and keyboard use an adjustable stand so
you can view the screen at eye level.
Headset
If you use a telephone frequently or use your computer when on
the telephone:
1. Consider using a headset to prevent awkward neck postures
2. Position the telephone on your non-dominant side within easy
reach.
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Paper / Document Holders
If you read from documents whilst typing, consider using a document
holder/stand, located either in line with the keyboard or to the side of the
monitor on an angle.
Good lighting System
A crucial component to setting up your workstation is your
lighting, which can be associated with vision problems
(eyestrain, dry eyes, itchy/irritated eyes), health problems,
and reduced work performance. Computer work can be
particularly visually demanding. Ergonomics experts
recommend good lighting to reduce eye strain and avoid
stretching out your neck at an unnatural angle.
Best Lighting for Your Work Space
1. The ambient lighting you use should be low or
glare free.
2. Your light level should be appropriate for your tasks.
3. Use blinds or drapes to control the light from windows.
4. Fluorescent lighting is preferable to other types of office lighting.
Safety risk reduction at workstation
Many who use computers, printers, routers and other electronic device at work or
home may be unaware of workstation situations that can increase their risk of
development of injury. In this lesson, we will assess the possible heat that machines
generates and how to reduce the excess heat.
Why does machine generate heat?
Just like your body can become overheated, a computer and other electronic
devices can overheat as well. And while computers are built to withstand a high level
of heat, it is still possible for them to become too hot.
At times, you could hear the fan of your computer, printer or router working hard;
perhaps you have even felt a computer that is warm to the touch before. But have
you ever wondered why computers generate this amount of heat?
Essentially, the heat comes from the electricity working inside the computer. As it
flows through the various circuits and resistors inside your machine, some of that
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is similar to a light bulb, where current runs
through a wire and gets hot, glowing from the heat. As expected, a lightbulb is hot
to the touch after you have had it on for a while.
How to reduce excess heat from electronic devices
As the days get warmer, make sure to keep your computer and other electronic
gadgets nice and cool. Extreme heat can potentially damage your expensive
machine. Excess heat may be managed through the following ways:
1. Allow for Airflow: Make sure there is enough space around your devices; about
2-3 inches, and make sure the vents are clear and that there are no loose items
that could obstruct airflow around your electronic devices.
Most printers, computers, routers and other electronic devices have vents
located on the back or on the side. This configuration allows cool air to be pulled
in to the device from the front or from the sides and for the hot air to be forced
out through the back or to the sides.
2. Position Electronics Away from Heat: Never place your computer by a window
under direct sunlight. Move the computer to a cooler and cleaner area. It is best
to position it along the path of airflow from a fan or air conditioner
3. Do not Stack Them: Electronic devices get hot enough on their own. Stacking
them on top of each other produces and conducts even higher temperatures.
Keep your devices spread out and use shelves whenever possible.
4. Keep It Clean: Dirt in the form of dust, human or pet hair, etc. may slow down
the fan and eventually cause it to stop. Blow the dust away from all of your
gadgets. Remember to keep all of the vents clean and unobstructed.
5. In Case of Emergency, Shut Down: If one of your gadgets begins to overheat
and malfunction during the hot summer months, shut it down and disconnect its
power supply. Let it sit and cool down until the casing is no longer hot to the
devices, and keep the area clear to allow for proper airflow.
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ASSESSMENT TASK
Multiple choice
1. All the following are examples of
wearable devices except
A. Mobile Phone
B. Google glass
C. Smart watch
2. The digital form of printed book is
well known as
A. Digital book
B. E- book
C. E-paper
3. Saving your files in a remote location
and access them later through the
internet is called?
A. Cloud storage
B. Internet storage
C. Remote storage
4. All the following are examples of
smart card except
A. Ghana card
B. ATM card
C. Voters ID card
D. SSNIT card
5. Which of the following is not an
example of plug and play device?
A. Printer
B. Mouse
C. Keyboard
6. Which drivers control the proper
functioning of audio devices
connected to the computer system
A. LAN drivers
B. Sound drivers
C. Graphic drivers
7. Which amongst the following is
not an example of cloud storage
A.
B.
C.
D.
Hard drive
Google drive
One drive
iCloud
Structured Questions
1. What is cloud storage?
2. State
two
advantages
and
disadvantages of cloud storage
3. List four (4) examples of e-book
reader
4. Identify any three (3) uses of google
glasses.
5. Explain the following terms
i. E-paper
ii. E-book
iii. Smart card
iv. Plug and play
6. Identify any three (3) ways to reduce
excess heat caused by computers
and printers.
7. State three (3) ergonomics each of
using the following devices.
i. Mouse
ii. Keyboard
iii. Chair
8. List the steps involved in changing
the desktop icon.
9. Mention any four (4) examples of
plug and play device
10. State three (3) disadvantages of ebook over printed book.
11. Explain the term perceptual
computing.
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