El-Shorouk Academy
Acad. Year : 2014/2015
Higher Institute for Computer &
Term
: First
Course
:Introduction to Computers
Information Technology
Department of Computer Science
Section 4
Keyboard
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An input device containing numerous keys that can be used to input letters, numbers, and
other symbols.
Contains
o a numeric keypad (for entering numbers),
o function keys (for issuing commands in some programs),
o Delete and Backspace keys (for deleting characters), Control and Alternate keys, such
as Ctrl+S to save the current document in some programs), Ctrl+A select all, Ctrl+C
copy, Ctrl+X cut, Ctrl+V past Ctrl+Z undo, Ctrl+Y redo Ctrl+ F find, Ctrl+G goto, Ctrl+H
replace, Ctrl+B Bold, Ctrl+N new document
ALT+F4 close program
o Special keys that are used for a specific purpose, such as to control the speaker
volume or DVD playback, or to launch an e-mail program or favorite Web site.
POINTING AND TOUCH DEVICES
Pointing device An input device that moves an on-screen pointer, such as an arrow, to allow the
user to select objects on the screen.
Mouse
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A common pointing device that the user slides along a flat surface to move a pointer around
the screen and clicks its buttons to make selections.
Mice today typically connect via a USB or mouse port, or via a wireless connection. Older
mechanical mice have a ball Most mice today are optical
Stylus an input device that is used to write electronically on the display screen.
Handwriting recognition the ability of a device to identify handwritten characters.
A graphics tablet
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Graphics tablet a flat, rectangular input device that is used in conjunction with a stylus to
transfer drawings, sketches, and anything written on the device to a computer.
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Touch screen a display device that is touched with the finger to issue commands or
otherwise provide input to then connected device
Joystick A variety of gaming devices today used as controllers to supply input to a computer
Trackball has the ball mechanism on top, instead of on the bottom. The ball is rotated with the thumb,
hand, or finger to move the on-screen pointer.
Touch pad a small rectangular-shaped input device, often found on notebook computers, that is touched
with the finger or thumb to control an on-screen pointer and make selections.
Scanner
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Optical scanner, captures an image of an object (usually a flat object, such as a printed document,
photograph, or drawing) in digital form, and then transfers that data to a computer.
Flatbed scanner. An input device that scans flat objects one at a time.
Portable scanner A scanner designed to capture input while on the go.
The quality of scanned images is indicated by optical resolution, usually measured in the number of
dots per inch (dpi).
Barcode A machine-readable code that represents data as a set of bars
Radio frequency identification (RFID) A technology used to store and transmit data located in RFID tags.
RFID tag A device containing a tiny chip and a radio antenna that is attached to an object so it can be
identified using RFID technology.
RFID reader. A device used to read RFID tags
Optical character recognition (OCR). The ability of a computer to recognize scanned text characters and
convert them to electronic form as text, not images.
Biometric reader A device used to input biometric data, such as an individual’s fingerprint or voice.
Digital camera an input device that takes pictures and records them as digital images.
Speech recognition system A system, consisting of appropriate hardware and software, used to recognize
voice input, such as dictation or audio computer commands.
Display device An output device that contains a viewing screen.
Monitor A display device for a desktop computer.
Display screen A display device built into a notebook computer, netbook, UMPC, or other device.
Color vs. Monochrome Displays
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Monochrome displays (in which each pixel can only be one of two colors, such as black or white)
Color displays (in which each pixel can display a combination of three colors—red, green, and
blue—in order to display a large range of colors).
Pixel The smallest colorable area in an electronic image, such as a scanned image, a digital photograph, or
an image displayed on a display
CRT Monitors vs. Flat-Panel Displays
CRT monitors a type of display device that projects images onto a display screen using a technology
similar to the one used with conventional TVs.
Flat-panel display a slim type of display device that uses electronically charged chemicals or gases
instead of an electron gun to display images.
Liquid crystal display (LCD) a type of flat-panel display that uses charged liquid crystals to display
images.
Organic light emitting diode (OLED) display a type of flat-panel display that uses emissive organic
material to display brighter and sharper images.
Plasma displays A type of flat-panel display that uses layers of gas to display images; most often used on
large displays.
Data projector a display device that projects all computer output to a wall or projection screen.
Multifunction device (MFD). A device that offers multiple functions (such as printing, scanning, and faxing)
in a single unit.
Laser printer an output device that uses toner powder and technology similar to that of a photocopier to
produce images on paper.
Ink-jet printer an output device that sprays droplets of ink to produce images on paper.
Photo printer An output device designed for printing digital photographs.
Barcode printer An output device that prints barcoded documents.
Portable printer A small, lightweight printer designed to be used while on the go.
3D printer An output device designed to print three-dimensional objects, such as product prototypes.
Computer speakers Output devices connected to computers that provide audio output.
Headphones A personal audio output device used by an individual so only he or she can hear the sound;
headphones with a built-in microphone are typically referred to as headsets.
Question
1. Mouse A common pointing device that the user slides along a flat surface to move a pointer Around
the screen and clicks its buttons to make selections.
2. RFID tag A device containing a tiny chip and a radio antenna that is attached to an object so it
can be identified using radio frequency identification technology.
3. Touch screen A display device that is touched with the finger to issue commands or otherwise provide
input to the connected device.
4. Scanner An input device that reads printed text and graphics and transfers them to a computer in digital
form.
5. Stylus An input device that is used to write electronically on the display screen.
6. Digital camera an input device that takes pictures and records them as digital images.
7. Laser printer an output device that uses toner powder and technology similar to that of a photocopier
to produce images on paper.
8. OLED display a type of flat-panel display that uses emissive organic material to display brighter and
sharper images.
9. ink-jet printer an output device that sprays droplets of ink to produce images on paper.
10. Optical character recognition (OCR) the ability of a scanning device to recognize scanned text
characters and converts them to electronic form as text, not images.
1. F A keyboard is an example of a pointing device.
2. T Most digital still cameras store photos on flash memory media.
3. T UPC is a type of barcode.
4. T F Consumer kiosks located in retail stores commonly use touch screens for input.
5. T F An ink-jet printer normally produces a better image than a laser printer.
6. With OCR software, pen-based computers can convert handwritten text into editable, typed text.
7. A (n) scanner can be used to convert flat printed documents, such as a drawing or photograph, into
digital form.
8. The smallest colorable area in an electronic image (such as a scanned document, digital hotograph, or
image displayed on a display screen) is called a (n) pixel.
9. Portable computers and mobile devices virtually always use flat-panel or LCD displays, while some
desktop computers may use the larger, more bulky monitors’ cathode-ray tube or CRT
10. Match each input device to its input application, and write the corresponding number in the blank to the
left of the input application.
A. stylus Pen-based computing
B. touch screen Consumer kiosk
C. Keyboard Text-based data entry
D. Biometric reader secure facility access
E. RFID tag tracking goods.