Module 3:
Parts of System Unit
and their Functions
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Computer Systems Servicing NCII – Grade 11 Quarter 1 –
Module 3: Parts of System Unit and their Functions
For the learner:
Welcome to Computer Systems Servicing NCII Module on Parts of System Unit
and their Functions. The hand is one of the most symbolized 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 material while being an active
learner.
This module has the following parts and corresponding icons:
Expectation - These are what you will be able to know after
completing the lessons in the module
Pre-test - This will measure your prior knowledge and the
concepts to be mastered throughout the lesson.
Recap - This section will measure what learnings and skills
that you understand from the previous lesson.
Lesson- This section will discuss the topic for this module.
Activities - This is a set of activities you will perform.
Wrap Up- This section summarizes the concepts and
applications of the lessons.
Valuing-this part will check the integration of values in the
learning competency.
Post-test - This will measure how much you have learned
from the entire module. Ito po ang parts ng module
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EXPECTATION
After completing this lesson, you should be able to:
1. identify the parts of the system unit;
2. understand functions of each component of system unit;
3. appreciate the importance of identifying and understanding the
components of System Unit.
PRE–TEST
DIRECTION: Identify the following components of System Unit. Write your
answer on the space provided before the number.
1.
2.
3.
4.
5.
3
6.
7.
8.
9.
10.
RECAP
DIRECTION: Identity the following statement carefully. Write TRUE if the
statement is correct and FALSE if it’s not. Write your answer on the space
provided before the number.
__________1. The monitor is an output device used to display information.
__________2. A keyboard is an input device that allows a person to enter
letters, numbers, and other symbols
__________3. A computer mouse is a handheld hardware output device that
controls a cursor in a GUI (graphical user interface) and can move
and select text, icons, files, and folders on your computer.
__________4. A VGA cable is use to connect the monitor into system unit to
display data.
__________5. The System Unit is a part of computer system which encloses all
the internal components of a computer.
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LESSON
The system unit is the box-like case that contains the electronic
components of a computer including the motherboard, CPU, RAM, and other
components. The system unit also includes the case that houses the internal
components of the computer. Many people erroneously refer to this as the
CPU.
The following are the components of system unit.
1. Motherboard
➢ It is sometimes called the system
board or main board.
➢ It is the main circuit board of a
microcomputer.
➢ This component contains the
connectors for attaching additional boards.
2. Power Supply Unit
➢ This is the device that supplies
power to your personal computer.
➢ It regulates the voltage to eliminate
spikes and surges common in
most electrical systems.
3. Hard Disk Drive
➢ This is the computer's main storage
device used to store all data on the
computer permanently.
➢ There are two types of HDD
according to its connector:
1. SATA (Serial ATA)
2. EIDE (Enhanced Integrated
Drive Electronics)
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4. Optical Disk Drive
➢ This type of drive allows a user to
retrieve, edit and delete the content
from optical disks such as CDs,
DVDs and Blu-ray disks.
➢ There are two types of ODD
according to its connector:
1. SATA (Serial ATA)
2. EIDE (Enhanced Integrated
Drive Electronics)
5. RAM (Random Access Memory)
➢ It is the memory which stores data
until the machine is working.
➢ It allows stored data to be accessed
randomly.
➢ Its main function is to store the data temporarily.
6. CPU (Central Processing
Unit)
➢ It is the brain of the
computer.
➢ Responsible for
processing arithmetic &
logical operations
➢ It runs the operating
system and applications,
constantly receiving
input from the user or
active software programs.
7. CPU Cooling System
➢ Also known as CPU Fan &
Heatsink
➢ It is designed to reduce
the ambient temperature
from the CPU to keep the
computer in running condition.
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8. EIDE (Enhanced Integrated
Drive Electronics) Cable
➢ It is a standard interface
used to connect
EIDE type of Drives such
as Hard Disk Drive
(HDD), CD-ROM or DVD-
ROM.
9. SATA (Serial ATA) Cable
➢ It is used to connect SATA
type Drives such as
HDD, Optical Drives and
Solid State Drives (SSD).
10. Video Card
➢ It is also known as
graphics card
➢ It is use to generate and
display the output
images to a computer
monitor.
➢ Can be connected to
monitor using The
following data cable:
1. VGA Cable
2. HDMI Cable
3. DVI Cable
11. NIC (Network Interface
Card)
➢ Also known as LAN Card
or network adapter card
➢ It is use connect
computers to a network
using network cables.
12. Wireless NIC (Network
Interface Card)
➢ It is use connect
computers to a network using (radio
frequency)
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➢ Capable of establishing wireless
network
13. Sound Card
➢ It is also known as Audio Card Adapter
➢ It provides input and output of audio signals to and
from a computer under control of computer
programs.
ACTIVITIES
I. DIRECTION: Complete the crossword by filling in a word that fits each
clue.
Across:
1. It is also known as Audio Card Adapter.
3. It is the main circuit board of a microcomputer.
4. It is used to connect SATA type Drives (HDD/ODD) to the motherboard.
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5. This component reads and writes data from optical disks through laser beaming
technology.
8. It is considered as the brain of the computer.
9. This device allows computer to be connected in a network using cables.
Down:
2. It connects EIDE drives to the motherboard.
6. This is the device that supplies power to your personal computer.
7. It is use to generate and display the output images to a computer monitor.
10. It allows stored data to be accessed randomly.
II. DIRECTION: Read each statement below carefully. Write TRUE if the
statement is correct, otherwise FALSE if it’s not. Write your answer on the
space provided.
________1. The Voltage Regulator regulates the voltage to eliminate spikes
and surges common in most electrical systems.
________2. Video Card provides input and output of audio signals to and from
a computer under control of computer programs.
________3. Random Access Memory runs the operating system and
applications, constantly receiving input from the user or active software
programs.
________4. Optical Disk Drive type of drive that allows a user to retrieve, edit
and delete the content from optical disks such as CDs, DVDs and Blu-ray
disks.
________5. Hard Disk Drive is the computer's main storage device used to
store all data on the computer permanently.
WRAP–UP
DIRECTION: Complete the following sentences base on what you’ve learn.
1. System Unit is the ______________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________.
2. The parts of the System Unit are as follows
_______________________________
________________________________________________________________________
________________________________________________________________________
_________________________________.
3. Write the functions of the following components of System Unit,
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a. Motheboard __________________________________________________________
_____________________________________________________________________.
a. AVR _________________________________________________________________
_____________________________________________________________________.
a. CPU _________________________________________________________________
_____________________________________________________________________.
a. RAM _________________________________________________________________
_____________________________________________________________________.
, VALUING
DIRECTION: Read the following questions carefully. State your answer in
two to three sentences each number on the space provided.
1. Why is it important for us to learn the components of System Unit?
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
2. How will you use the knowledge you acquired about components of
System Unit?
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
3. Cite a situation in which you can apply the knowledge of
understanding components of System Unit.
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
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POST TEST
DIRECTION: Identify the following components of system unit. Write your
answer on the space provided.
1. It is used to connect SATA type Drives (HDD/ODD) to the motherboard.
2. This device is Capable of establishing wireless network.
3. It is also known as graphics card and use to generate and display the output
images/information to a computer monitor.
____________4. This component contains the connectors for attaching
additional boards.
____________5. It runs the operating system and applications, constantly
receiving input from the user or active software programs.
6. It is used to connect SATA type Drives (HDD/ODD) to the motherboard.
7. It is designed to reduce the ambient temperature from the CPU to keep
the computer in running condition.
8. It provides input and output of audio signals to and from a computer
under control of computer programs.
9. This type of drive allows a user to retrieve, edit and delete the content
from optical disks such as CDs, DVDs and Blu-ray disks.
10. Its main function is to store the data temporarily.
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