7
Technology and
Livelihood Education
COMPUTER SYSTEM SERVICING
Quarter 1-Module 4
PREPARING AND INTERPRETING
TECHNICAL DRAWING
Department of Education ● Republic of the Philippines
Technology and Livelihood Education – Grade 7
Alternative Delivery Mode
Quarter 1-Module 4
First Edition, 2020
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Published by the Department of Education
Secretary: Leonor Magtolis Briones
Undersecretary: Diosdado M. San Antonio
Development Team of the Module
Author/s:
Rodjiel C. Dumasapal
Reviewers:
Romne Ryan M. Portacion, HT I, Sapang Dalaga NHS
Sunnyboy L. Ibarra, T II, Sinonoc NHS
Jumel P. Panoncillo, T I, Clarin NHS
Illustrator and Layout Artist:
Evaluator:
Rodjiel C. Dumasapal
Manny P. Daleon, MT-II, Talisayan NHS
Management Team
Chairperson:
Co-Chairpersons:
Printed
in the Philippines by
Members:
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Regional Director
Dr. Victor G. De Gracia Jr. CESO V
Asst. Regional Director
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Schools Division Superintendent
Myra P. Mebato, PhD, CESE
Asst. Schools Division Superintendent
Mala Epra B. Magnaong, Chief ES, CLMD
Neil A. Improgo, EPS-LRMS
Bienvenido U. Tagolimot, Jr., EPS-ADM
Samuel C. Silacan, EdD, CID Chief
Joseph T. Boniao, EPS –EPP/TLE
Rone Ray M. Portacion, EdD, EPS – LRMS
Edwin V. Palma, PSDS
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7
Technology and
Livelihood Education
COMPUTER SYSTEM SERVICING
Module 4
PREPARING AND INTERPRETING
TECHNICAL DRAWING
This instructional material is collaboratively developed and reviewed by
educators from public schools. We encourage teachers and other education
stakeholders to email their feedback, comments, and recommendations to the
Department of Education – Region 10 at region10@deped.gov.ph.
Your feedback and recommendations are highly valued.
Department of Education ● Republic of the Philippines
Introductory Message
For the learner:
Welcome to the Technology and Livelihood Education 7 Alternative
Delivery Mode (ADM) Module on Preparing and Interpreting Technical Drawing.
The hand is one of the most symbolic part of the human body. It is often
used to depict skill, action, and purpose. Through our hands, we may learn,
create, and accomplish. Hence, the hand in this learning resource signifies that
you as a learner is capable and empowered to successfully achieve the relevant
competencies and skills at your own pace and time. Your academic success
lies in your own hands!
This module was designed to provide you with fun and meaningful
opportunities for guided and independent learning at your own pace and time.
You will be enabled to process the contents of the learning resource while being
an active learner.
This module has the following parts and corresponding icons:
What I Need to
Know
This will give you an idea of the skills or
competencies you are expected to learn
in the module.
What I Know
This part includes an activity that aims to
check what you already know about the
lesson to take.
What’s In
This is a brief drill or review to help you
link the current lesson with the previous
one.
What’s New
In this portion, the new lesson will be
introduced to you in various ways such as
a story, a song, a poem, a problem
opener, an activity, or a situation.
What is It
This section provides a brief discussion of
the lesson. This aims to help you discover
and understand new concepts and skills.
What’s More
This comprises activities for independent
practice to solidify your understanding
and skills of the topic.
What I Have
Learned
This includes questions or blank
sentences/paragraphs to be filled in to
process what you learned from the
lesson.
What I Can Do
This section provides an activity that will
help you transfer your new knowledge or
skill into real-life situations or concerns.
Assessment
This is a task which aims to evaluate your
level of mastery in achieving the learning
competency.
Additional
Activities
In this portion, another activity will be
given to you to enrich your knowledge or
skill of the lesson learned. This also tends
to the retention of learned concepts.
Answer Key
This contains answers to all activities in
the module.
At the end of this module you will also find:
References
This is a list of all sources used in
developing this module.
The following are some reminders in using this module:
1. Use the module with care. Do not put unnecessary mark/s on any part
of the module. Use a separate sheet of paper in answering the exercises.
2. Don’t forget to answer What I Know before moving on to the other
activities included in the module.
3. Read the instruction carefully before doing each task.
4. Observe honesty and integrity in doing the tasks and checking your
answers.
5. Finish the task at hand before proceeding to the next.
6. Return this module to your teacher/facilitator once you are through with
it.
If you encounter any difficulty in answering the tasks in this module, do not
hesitate to consult your teacher or facilitator. Always bear in mind that you are
not alone.
We hope that through this material, you will experience meaningful learning
and gain a deep understanding of the relevant competencies. You can do it!
TABLE OF CONTENTS
Preparing and Interpreting Technical Drawing
What I Need to Know - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - -
1
What I Know - - - - - - - - - - - - - - - -- - - - - - - - - - - - _- - - - - - - - - - -
2
Lesson 1: Identify and Interpret Symbols
What’s In
- - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - - - - - -
3
What’s New - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - - - - - -
3
What is It
- - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - - - - - -
4
Flowchart
- -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- -
4
Interpreting Flowchart - -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
9
What’s More - - - - -- - - - - - - - - - - - - - - - - - - - - - - - - - -- - - -- - -
12
Lesson 2: Electrical/Electronic Schematic
How to Read Circuit Diagram for Beginners - - - - - - - - - - - - - - - -
13
What’s More - -- - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - -
17
What I Have Learned - -- - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - -
18
What I Can Do - -- - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - -
19
Assessment - -- - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - -
20
Additional Activities - -- - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - -
21
Answer Key - -- - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - -
22
References - -- - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - -
23
Author’s Profile - - - - - - - - - - - - - - - -- - - - - -- -- - - - - - - - - - - - - - -
24
What I Need to Know
Welcome to lesson 4 in preparing and interpreting technical drawings.
This module was designed to guide you in identifying the different types of
technical drawings. You will learn to identify the basic symbols used in the
flowcharting and interpreting it into a real-life situation. You will be able to learn
and experience the basic electronic schematic diagram. And also you will learn
to store technical drawings and equipment in proper procedure.
After going through this module, you are expected to:
1. Identify and interpret the symbols used in the drawing.
(TLE_IACSS9-12PITD-IIg-h-14)
2. Draw and identify correctly electrical/electronic schematic.
(TLE_IACSS9-12PITD-IIg-h-15)
3. Identify correct technical drawings and select proper equipment by job
requirements. (TLE_IACSS9-12 PITD-IIg-h-16)
1
What I Know
Before starting with this module, let us find out what you already know
about Preparing and Interpreting Technical Drawing (PITD). Follow and answer
the activity below.
Directions: Identify the following computer symbols below. Select the words of
the correct answer inside the box. Write your answer in your CSS
activity notebook.
1.
6.
11.
16.
2.
7.
12.
17.
3.
8.
13.
18.
4.
9.
14.
19.
5.
10.
15.
20.
Folder
Fire
Trademark
Calendar
Cancel/Stop
QR Code
Registered Mark
Trash can
Padlock
Plus
Recycle
Minus
Thumbtack
Check mark
Bulb
Question mark
Gear
Copyright
Speech bubble
Wrench/Screw
2
Lesson
1
Identify and Interpret Symbols
What’s In
Before we proceed to our lesson, let us have a review of the previous.
Can you identify at least one component to be measured? Do you know what
is RAM? Can you draw it in your CSS activity notebook? If you can, how did
you familiarize yourself with the component? Do you know that in this lesson
you will be able to familiarize and identify the different symbols used by
computers? All you need to do is to follow the symbols used in technical
activities involve in Computer Systems Servicing.
What’s New
What can you say about the sign in the picture below? Do you still want
to touch on that thing? How about if there was no sign appeared on and
accidentally you hold on it? What should you do? Now let us know how
important the symbol in dealing with the danger is. Just like using the computer,
you need to know some symbols to be aware of what was it means.
https://www.google.com/search?q=elect
ric+shock+hazard+symbol&tbm
3
What is It
Computer Symbols
There are thousands of symbols used by computers today to represent
a function, specification, certification, company, or warning. For example, one
of the most recognizable symbols is an almost full circle with a vertical line at
the top that indicates power. Let us identify the most commonly displayed
symbols used with computers and electronics, with a brief description of what
each symbol means.
Note that most symbols are not standardized, which means the symbols
shown below may not match your software program or hardware device.
However, these symbols should be close enough to what you are looking for
that you can identify the meaning of each symbol.
General Symbols
1. A question mark symbol represents a question and allows you
to access help or online documentation.
2. A light bulb icon symbol represents a tip or an idea. For
example, on this page, we have several tips that can be quickly
identified with the light bulb next to the word "Tip."
3. The gear symbol indicates a configuration or settings option. For
example, many programs use a gear icon for buttons that allow
you to adjust a program's settings. Online services may use a
gear icon for the area that lets you change your account settings.
4. A symbol with a wrench or a wrench and screwdriver is
another symbol that can be used in place of the gear to indicate
an area to adjust the settings or other options.
4
5. A speech bubble symbol is used in communications to indicate
there is a message that needs to be read or that someone is
typing
a
message.
For
example,
on
an
iPhone,
the Messages icon and each of its messages uses the speech bubble
symbol and when someone is typing a speech bubble with three periods is
shown.
6. The check mark symbol indicates completion or that something
is ok. For example, a download dialog box may show a green
check mark when the download is complete.
7. A plus symbol or a horizontal line crossing a vertical line is also
a symbol used as an indication to increase, add, move down,
or zoom in on software programs and hardware devices.
8. A minus symbol or a horizontal line is a symbol used as an
indication for decreasing, removing, moving up, or zooming out
on software programs and hardware devices. On a Microsoft
Windows keyboard, the minus or underscore is also shown on
the top-right side of a window to represent the minimize feature.
9. A circle with a line through it is a symbol that represents cancel
or stop and may be over the top of another symbol. For
example, a speaker symbol with this over it indicates mute. Tip:
this symbol may also be represented by an X.
10. Three arrows going around a triangle is a symbol that
represents recycle or recycling. Anything with this symbol that
is not crossed out should be recycled.
11. A symbol with a series of boxes and jagged lines with boxes in
the corners like that shown here is a QR Code and used to
store information for scanning. For example, you could scan the
5
QR code shown here to open the Computer Hope web page. Similar
markings could also be a matrix code or a barcode.
12. A padlock symbol is used to represent when anything is locked
or secure. For example, a keyboard key with a lock can give
you the option to lock the computer.
13. A calendar icon is used to represent an option that allows the
user to view a calendar, view date related information, or
schedule an event.
14. The thumbtack symbol is used to represent the ability to pin an
object to the screen. For example, with web applications and
some web pages, you may be able to pin individual elements
you enjoy viewing to the top of a page for quick viewing.
15. A symbol of a folder represents an area capable of storing
other files and folders on a computer.
16. A symbol of a trash can or a recycle bin is a symbol used to
represent deleting a file or another object on the computer and
may be a container for any deleted items.
17. The fire symbol can have many different meanings when
used on a computer, software program, or an Internet web
page. The first meaning is that the item is hot and could mean
that it is critical, important, or popular and should be looked at
first. In some e-mail programs and services, the fire symbol represents junk,
and is a location where all spam and other junk e-mails are stored.
18. A C with a circle surrounding it is used to represent a Copyright.
For example, at the bottom of many web pages (including this
page) the Copyright symbol or (c) may be shown to indicate the
content on the page is Copyrighted.
6
19. An R with a circle surrounding it is used to represent a
registered mark. For example, this mark may be seen by a
company logo or brand name that is a registered mark.
20. A TM with a circle surrounding it or TM by itself is used to
represent a trademark.
7
What’s More
Activity 1. The Match Maker.
Directions: Match Column A with Column B. Write only the letter of the correct
answer in your CSS activity sheets.
Column A
Column B
a.
1. Represent a trademark.
b.
2. Represents a tip or an idea.
c.
3. Represent a registered mark.
4. Represents recycle or recycling.
d.
5. Used to store information for scanning.
e.
6. Represent when anything is locked or secure.
f.
7. Represent the ability to pin an object to the screen.
g.
8. Symbol indicates a configuration or settings option.
9. Symbol indicates completion or that something is ok.
h.
10. Represents a question and allows you to access help or
online documentation.
i.
11. Represents an area capable of storing other files and
folders on a computer.
j.
12. Often found at the bottom of many web pages to indicate
the content of the page is copyrighted.
k.
13. Represent deleting a file or another object on the computer
and may be a container for any deleted items.
l.
14. Used in communications to indicate there is a message
that needs to be read or that someone is typing a message.
m.
n.
15. Represent an option that allows the user to view
a calendar, view date related information, or schedule an
event.
8
o.
Lesson
2
Electrical/Electronic Schematic
What is It
Schematic Diagram
Circuit or schematic diagrams consist of symbols representing physical
components and lines representing wires or electrical conductors. To learn how
to read a circuit diagram, it is necessary to learn what the schematic symbol of
a component looks like. It is also necessary to understand how the components
are connected in the circuit.
https://www.startingelectronics.org
Circuit Symbols and Physical Components
Each electronic or electrical component is represented by a symbol as
can be seen in this simple circuit diagram. Lines used to connect the symbols
represent conductors or wires. Each symbol represents a physical component
that may look as follows.
9
https://www.startingelectronics.org
Component References
Components in a circuit should always have references, also
called reference designators, used to identify the components in the circuit. This
allows the components to easily be referenced in text or a component list. A
battery may have the reference designator "BAT" and a light bulb may have a
reference "L".
Because there could be more than one battery or light bulb in a circuit,
reference designators will usually always end with a number, e.g. BAT1 and L1
as shown in the circuit below. A second light bulb in the circuit would then have
the reference designator L2.
https://www.startingelectronics.org
10
Parallel Circuit Example
In the circuit below, two light bulbs are connected in parallel to a battery
power source. It can be seen that the top terminals of the two light bulbs are
connected and to the positive terminal of the battery. We know this because the
three terminals or connection points have a node where they intersect.
The bottom terminals of the bulbs are connected and the negative
terminal of the battery because the second node shows these connections.
https://www.startingelectronics.org
Series Circuit Example
In the series circuit below, two light bulbs are connected in series. No
nodes are necessary in this circuit to show the bulbs connecting and the battery
because single wires are connecting straight to each other. Nodes are only
placed if three or more wires are connected.
https://www.startingelectronics.org
11
Common Electrical/Electronic Circuit Symbols
Component
Wire
Wires
Joined
Unjoined
Wires
Circuit Symbol
Wire Circuit Symbol
Wires Joined Circuit
Symbol
Wires Not Joined Circuit
Symbol
Description
Used to connect one
component to another.
One device may be connected to
another through wires. This is
represented by drawing “blobs”
on the point where they are
shorted.
When circuits are drawn some
wires may not touch others. This
can only be shown by bridging
them or by drawing them without
blobs. But bridging is commonly
practiced as there will not arise
any confusion.
A battery has more than a cell
and is used for the same
purpose. The smaller terminal is
negative and the larger one is
positive. Abbreviated as ‘B’.
Battery
DC Supply
AC Supply
Battery Circuit Symbol
DC Supply Circuit Symbol
Used as a DC power supply,
that is, the current will always
flow in one direction.
AC Supply Circuit Symbol
Used as AC power supply, that
is, the current will keep
alternating directions.
12
Fuse
Transformer
Fuse Circuit Symbol
Transformer Circuit
Symbol
Used in circuits where a
probability of excessive current
flows. The fuse will break the
circuit if excessive current flows
and saves the other devices
from damage.
Used as an ac power supply.
Consists of two coils, the
primary and secondary that are
linked together through an iron
core. There is no physical
connection between the two
coils. The principle of mutual
inductance is used to obtain
power. Abbreviated as ‘T’.
Used in electronic circuits to
represent the 0 volts of the
power supply. It can also be
defined as the real earth , when
it is applied in radio circuits and
power circuits.
Earth/Ground
Resistor
Rheostat
Potentiometer
Earth Circuit Symbol
Resistor Circuit Symbol
A resistor is used to restrict the
amount of current flow through
a device. Abbreviated as ‘R’.
Rheostat Circuit Symbol
A rheostat is used to control
the current flow with two
contacts.
Applicable
in
controlling lamp brightness,
capacitor charge rate, etc.
Potentiometer Circuit
Symbol
A potentiometer is used to
control the voltage flow and has
three
contacts.
Have
applications in changing a
mechanical angle change to an
electrical
parameter.
Abbreviated as ‘POT’.
13
Capacitor
Capacitor –
Polarized
Variable
Capacitor
Capacitor Circuit Symbol
Capacitor-Polarised
Circuit Symbol
Variable Capacitor Circuit
Symbol
Capacitor is a device that is
used to store electrical energy.
It consists of two metals plates
that are separated by a
dielectric. It is applicable as a
filter, that is, to block DC
signals and allow AC signals.
Abbreviated with the letter ‘C’.
Capacitor can be used in a
timer circuit by adding a
resistor.
Used to vary the capacitance
by turning the knob. A type of
variable capacitor is the
trimmer capacitor that is small
in size. The notations are all the
same.
A diode is used to allow electric
current to flow in only one
direction. Abbreviated as ‘D’.
Diode
Light Emitting
Diode (LED)
Zener Diode
Photo Diode
Diode Circuit Symbol
LED is used to emit light when
a current is passed through the
device. It is abbreviated as
LED.
LED Circuit Symbol
Zener Diode Circuit
Symbol
Photo Diode Circuit
Symbol
14
After a breakdown voltage, the
device allows current to flow in
the reverse direction as well. It
is abbreviated as ‘Z’.
Photodiode works as a photodetector and converts light into
its corresponding voltage or
current.
Tunnel Diode
Schottky Diode
NPN
Transistor
PNP
Transistor
Phototransistor
Tunnel Diode Circuit
Symbol
Schottky Diode Circuit
Symbol
Transistor NPN Circuit
Symbol
Transistor PNP Circuit
Symbol
Phototransistor Circuit
Symbol
Tunnel Diode is known for its
high-speed operation due to its
application
in
quantum
mechanical effects.
The Schottky Diode is known
for its large forward voltage
drop and hence has great
applications
in
switching
circuits.
This is a transistor with a layer
of P-doped semiconductor
fixed between two layers of Ndoped semiconductors that act
as the emitter and collector.
Abbreviated as ‘Q’.
This is a transistor with a layer
of N-doped semiconductor
fixed between two layers of Pdoped semiconductors that act
as the emitter and collector.
Abbreviated as ‘Q’.
The
working
of
a phototransistor is similar to
that of a bipolar transistor with
a difference that it converts
light into its corresponding
current. The phototransistor
can also act as a photodiode if
the emitter is not connected.
Voltmeter is used to measure
the voltage at a certain point in
the circuit.
Voltmeter
Voltmeter Circuit Symbol
15
An Ammeter is used to
measure the current that
passes through the circuit at a
particular point.
Ammeter
Galvanometer
Ammeter Circuit Symbol
Galvanometer Circuit
Symbol
A galvanometer is used to
measure very small currents in
the order of 1 milli ampere or
less.
Resistance of the circuit is
measured using an Ohmmeter.
Ohmmeter
Oscilloscope
Push Switch
Push to Break
Switch
Singe Pole
Single Throw
Switch
Ohmmeter Circuit Symbol
Oscilloscope Circuit
Symbol
Push Switch Circuit
Symbol
Push to Break Switch
Circuit Symbol
On Off Switch (SPST)
Circuit Symbol
16
An oscilloscope is used to
measure the voltage and time
period of signals along with
their shape display.
This is an ordinary switch that
passes current only upon
pressing.
The push to break switch is
usually kept in the ON state
(closed). It turns to OFF state
(open) only when the switch is
pressed.
Also known as the ON/OFF
switch. This switch allows the
flow of current only when it is
kept ON. Abbreviated as
SPST.
Single Pole
Double Throw
Switch
Double Pole
Single Throw
Switch
Double Pole
Double Throw
Switch
2-Way Switch (SPDT)
Circuit Symbol
Dual On-Off Switch
(DPST) Circuit Symbol
Also known as the 2-way
switch. It can be also called as
an ON/OFF/ON switch as it has
an OFF position in the center.
The switch causes the flow of
current in two directions,
depending on its position. It
can be abbreviated as SPDT.
Abbreviated as DPST. Can
also be called as a dual ONOFF switch. This is used to
isolate between the live and
neutral connections in the main
electrical line.
Abbreviated as DPDT. The
switch uses a central OFF
position and is applied as
reversing switch for motors.
DPDT Circuit Symbol
Relay is abbreviated as ‘RY’.
This device can easily switch a
230 Volt AC mains circuit. It
has three switching stages
called Normally Open (NO).
Normally Closed (NC), and
Common (COM).
Relay
Microphone
Relay Circuit Symbol
Microphone Circuit
Symbol
This device is used for
converting
sound
to
its
corresponding
electrical
energy. Abbreviated as ‘MIC’.
Does the reverse process of
microphone
and
converts
electrical energy into sound.
Earphone
Earphone Circuit Symbol
17
Loudspeaker
PiezoTransducer
Loudspeaker Circuit
Symbol
PiezoTransducer Circuit
Symbol
Does the same operation as an
earphone, but converts an
amplified version of the
electrical energy into its
corresponding sound.
It is a transducer that converts
electrical energy into sound.
Used to amplify a signal. It is
mainly used to represent a
whole circuit rather than just
one component.
Amplifier
Amplifier Circuit Symbol
This device is used to
transmit/receive
signals.
Abbreviated as ‘AE’.
Aerial
Aerial Circuit Symbol
This is used to provide light for
the output.
Lighting Lamp
Indicator Lamp
Lamp Circuit Symbol
Lamp Indiator Circuit
Symbol
Used to convert electrical
energy into light. The best
example is the warning light on
a car dashboard.
This transducer is used to
change electrical energy into
heat.
Heater
Inductor
Heater Circuit Symbol
Inductor Circuit Symbol
18
Inductor is used to produce a
magnetic field when a certain
current is passed through a coil
of wire. The wire is coiled on a
soft
iron
core.
Have
applications in motors, and
tank circuits. Abbreviated as
‘L’.
This device is used to convert
electrical
energy
into
mechanical energy. Can be
used as a generator as well.
Abbreviated as ‘M’.
Motor
Motor Circuit Symbol
Used to produce a sound as
the output, according to the
electrical energy produced as
the input.
Bell
Bell Circuit Symbol
It is used to produce an output
sound corresponding to the
electrical energy in the input.
Buzzer
Light
Dependent
Resistor
(LDR)
Buzzer Circuit Symbol
It is abbreviated as LDR. Light
Dependent Resistor is used to
convert light into its corresponding
resistance. Instead of directly
measuring the light, it senses the
heat content and converts it onto
resistance.
LDR Circuit Symbol
Instead of directly measuring the
light, a thermistor senses the heat
content and converts it into
resistance. Abbreviated as ‘TH’.
Thermistor
Thermistor Circuit Symbol
19
Logic Gate Symbols
Gate
AND
Gate
NAND
Gate
OR
Gate
NOR
Gate
EXOR
Gate
Standard Symbol
AND GATE Symbol
NAND Gate Symbol
OR Gate Symbol
NOR Gate Symbol
EX-OR Gate Symbol
IEC Symbol
AND Gate IEC
Symbol
NAND Gate IEC
Symbol
OR Gate IEC
Symbol
NOR Gate IEC
Symbol
EX-OR Gate IEC
Symbol
20
Description
If all the inputs of an
AND
gate
are
HIGH, then the
output will also be
HIGH. If any one of
them is LOW, the
output will also be
LOW.
Short form for NOT
AND Gate. Of all the
inputs are HIGH,
the output will be
LOW. If any one
input is LOW, the
output will be HIGH.
If any one of the
input is HIGH, the
output will also be
HIGH. If both inputs
are LOW, the output
will also be LOW.
Short form for NOT
OR. If both inputs
are LOW, the output
will also be LOW.
For other cases, the
output will be HIGH.
Short
form
for
Exclusive NOR. If
both inputs are
either in LOW state
r HIGH state, the
output will be LOW.
If both inputs are
different, the output
will be HIGH.
NOT
Gate
Also known as the
inverter Gate. There
is only one input for
this gate. If the input
is HIGH, the output
will be LOW. If the
input is LOW, the
output will be HIGH.
NOT Gate Symbol
NOT Gate Symbol
21
What’s More
Activity 2. Draw Me Know.
Directions: Draw a circuit symbol of the following electrical/electronic
components below. Draw your output in your CSS activity
notebook.
1. Capacitor
11. Light
2. Resistor
Emitting
(LED)
3. Diode
12. NPN Transistor
4. Transformer
13. PNP Transistor
5. Earth/Ground
14. AND Gate
6. Battery
15. NAND Gate
7. DC Supply
16. OR Gate
8. AC Supply
17. Voltmeter
9. Potentiometer
18. Ammeter
10. Variable Capacitor
19. Ohmmeter
20. Push switch
22
Diode
What I Have Learned
Directions: Fill in the blank to make the sentence correct, write your
answer in your
CSS activity notebook.
1.
A _________ symbol represents a question and allows you to
access help or online documentation.
2.
A light bulb icon symbol represents a _______ or an ________.
3.
The ________ symbol indicates a configuration or settings
option.
4.
A symbol with a __________ is another symbol that can be
used in place of the gear to indicate an area to adjust the
settings or other options.
5.
A _______symbol is used in communications to indicate there
is a message that needs to be read or that someone is typing
a message.
6.
The ________ symbol indicates completion or that something
is ok.
7.
A circle with a line through it is a symbol that represents
________ or _________and may be over the top of another
symbol.
8.
Three arrows going around a triangle is a symbol that
represents _____.
9.
A ______ symbol is used to represent when anything is locked
or secure.
10. A ________ icon is used to represent an option that allows the
user to view a calendar, view date related information, or
schedule an event.
11. A symbol of a ___________ represents an area capable of
storing other files and folders on a computer.
12. A C with a circle surrounding it is used to represent a
___________.
23
13. An R with a circle surrounding it is used to represent
__________.
14. Each electronic or electrical component is represented by a
_______ as can be seen in this simple circuit diagram.
15. Circuit or __________ consist of symbols representing
physical components and lines representing wires or electrical
conductors.
24
What I Can Do
Activity 3: Circuit Tracker Just Do it.
Directions: Trace the following circuit diagram below and fill in the missing
circuit symbol to complete the circuit. Draw your output in your
CSS activity worksheet.
Resistor
Resistor
1. Dark Sensor Circuit Diagram
Battery
Light
Depend
ent
Resistor
NPN
Transis
tor
Buzzer
NPN
Transis
tor
Resis
tor
Resis
tor
25
Light
Emitting
Diode
Capacitor
Resistor
NPN
Transistor
Battery
Resistor
2. Clap Switch Circuit Diagram
Assessment
Now, that you are finished accomplishing the module, let us check what you
have learned.
Multiple Choice. Read the sentences carefully and choose the letter of the best
answer. Write your answers in your CSS activity notebook.
1. Consists of two coils, the primary and secondary that are linked together through
an iron core.
A. ammeter
B. inductor
C. Resistor
D. transformer
C. question mark
D. speech bubble
2. A symbol represents a tip or an idea.
A. bulb
B. gear
3. The symbol indicates a configuration or settings option.
A. bulb
B. gear
C. question mark
D. speech bubble
4. Is used to restrict the amount of current flow through a device.
A. capacitor
B. diode
C. resistor
D. NPN transistor
5. The symbol indicates completion or that something is ok.
A. calendar
B. check mark
C. padlock
D. thumbtack
6. Is a device that is used to store electrical energy.
A. capacitor
B. diode
C. resistor
D. NPN transistor
7. A symbol is used to represent when anything is locked or secure.
A. folder
B. padlock
C. QR code
D. recycle
8. Is used to emit light when a current is passed through the device.
A. LED
B. LDR
C. Resistor
D. NPN transistor
9. Represent the ability to pin an object to the screen.
A. calendar
B. thumbtack
C. trash can
D. trademark
10. A C with a circle surrounding it is used to represent a ____________.
A. Copyright
B. registered mark
C. trash can
D. trademark
11. Is used to measure the voltage at a certain point in the circuit.
A. Ammeter
B. galvanometer
C. ohmmeter D. voltmeter
12. An R with a circle surrounding it is used to represent a ____________.
A. Copyright
B. registered mark
C. trash can
D. trademark
13. Is used to measure the current that passes through the circuit at a particular point.
A. ammeter
B. galvanometer
C. ohmmeter D. voltmeter
14. A TM with a circle surrounding it or TM by itself is used to represent a ________.
A. Copyright B. registered mark
C. trash can
D. trademark
15. Is used to measure the resistant of the circuit.
A. ammeter B. galvanometer
C. ohmmeter D. voltmeter
26
Additional Activities
Congratulations! Job well done! Now you have prior knowledge of the
different circuit symbols you are also able to draw on it. This time we will make
a circuit diagram in actual application. Below is the picture of the AC - DC
converter circuit diagram. Your task is to perform actual wiring on the
components based on the circuit diagram. Don't worry because all the
components for this activity will be provided by your teacher. And during the
actual performance, your teacher will always be there to help you.
27
Activity 1 – Answer Sheet
Name of Student: ________________________ Year&Section: _________
Date: _______________ Score: ________ Equivalent Grade: ___________
1.
11.
2.
12.
3.
13.
4.
14.
5.
15.
6.
7.
8.
9.
10.
Check by: _______________________
Teacher’s Name & Signature
Noted by: _______________________
Parent’s Name & Signature
How many computer symbols do you identify?
If you got
Your Grade is
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
100
97
93
90
87
83
80
77
73
70
67
63
60
57
53
You are -
Remarks
Excellent
Keep up the best works!
Very Good
You can do more
Try Again
Please try again!
28
Activity 2 – Answer Sheet
Name of Student: ________________________ Year&Section: _________
Date: _______________ Score: ________ Equivalent Grade: ___________
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
Check by: _______________________
Teacher’s Name & Signature
Noted by: _______________________
Parent’s Name & Signature
How many circuit symbols do you draw?
If you got
Your Grade is
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
100
98
95
93
90
88
85
83
80
78
75
73
70
68
65
63
60
58
55
53
You are -
Remarks
Excellent
Keep up the best works!
Very Good
You can do more
Good
Try Harder!
Try Again
Please try again!
29
Activity 3 – Drawing Sheet
Name of Student: ________________________ Year&Section: _________
Date: _______________ Score: ________ Equivalent Grade: ___________
3. Dark Sensor Circuit Diagram
4. Clap Switch Circuit Diagram
Check by: _______________________
Teacher’s Name & Signature
Noted by: _______________________
Parent’s Name & Signature
30
Assessment – Answer Sheet
Name of Student: ________________________ Year&Section: _________
Date: _______________ Score: ________ Equivalent Grade: ___________
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
Check by: _______________________
Teacher’s Name & Signature
Noted by:
_______________________
Parent’s Name & Signature
31
Activity 2:
1.
2.
32
Activity 3:
1. Dark sensor circuit diagram
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
2. Claps swicth circuit diagram
13.
14.
15.
16.
17.
18.
19.
20.
What I have Know
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
Wrench/Screw
Speech bubble
Copyright
Gear
Question mark
Bulb
Check mark
Thumbtack
Minus
Recycle
Plus
Padlock
Trash can
Registered mark
QR code
Cancel/Stop
Calendar
Trademark
Fire
Folder
Activity 1:
1. E
2. L
3. O
4. J
5. I
6. H
7. G
8. M
9. N
10. K
11. A
12. C
13. F
14. B
15. D
Assessment
1. D
2. A
3. B
4. C
5. B
6. A
7. B
8. A
9. B
10. A
11. D
12. B
13. A
14. D
15. C
Answer Key
References
I. Internet
Symbols used by Computers
https://www.computerhope.com/issues/ch001801.htm#symbols
Circuit Diagram
https://startingelectronics.org/beginners/read-circuit-diagram/
https://www.circuitstoday.com/electronic-circuit-symbols
33
RODJIEL C. DUMASAPAL
TEACHER – II
BS COMPUTER ENGINEERING
BS EDUCATION
MAJOR IN MATH
TESDA National Certificate Training Qualifications:
1. Visual Graphic Design NC III
2. Computer Systems Servicing NC II
Trainer’s Qualification:
1. Licensed Teacher (LPT)
2. TM 1 Certified
Teaching Experiences:
1. Dep-Ed Looc National High School – Teacher II SY 2016 – Present
2. Saint Vincent’s College (Private) – Faculty
SY 2011 – 2012
For inquiries or feedback, please write or call:
Department of Education – Region 10
Zone 1, DepEd Building Masterson Avenue, Upper Balulang
Cagayan de Oro City, 9000
Telefax: (088) 880 7072
E-mail Address: region10@deped.gov.ph