Learning Activity Sheet (LAS) for grade 11 CSS Week 1 Only

1. LEARNING ACTIVITY SHEET
CSS Grade 11 – Second Quarter- Week 1
Objectives
MELC: Computer System and Parts of the System Unit
Specific Objectives
o To be able to know what is computer system and parts of a system unit.
o To be able to understand and explain the parts of a system unit.
o To put in mind the importance of the part of system unit.
What is it
Computer System
A computer system is a set of integrated devices that input,
output, process, and store data and information. Computer
systems are currently built around at least one digital
processing device. There are five main hardware components in
a computer system: Input, Processing, Storage, Output and
Communication devices.
The system unit, also known as a "tower" or "chassis," is the main part
of a desktop computer. It includes the motherboard, CPU, RAM, and
other components. The system unit also includes the case that houses
the internal components of the computer.
The term "system unit" is often used to differentiate between the
computer and peripheral devices, such as the monitor, keyboard,
and mouse. For example, if a repair shop asks you to bring in your
computer, it may be unclear whether you need to bring your monitor
and peripheral devices as well. If you are told to just bring your system
unit, it is clear you only need to bring the computer itself.

2. Parts of a System Unit
System Case
The primary function of the computer system unit is to hold all
the other components together and protect the sensitive
electronic parts from the outside elements.
Motherboard
A motherboard is one of the essential parts of a computer
system. It holds together many of the crucial components of a
computer, including the Central Processing Unit(CPU),
memory and connectors for input and output devices.
Power Supply
Power supply is an electronic device that supplies electric
energy to an electric load. The primary function of a power
supply is to convert one form of electrical energy to another
and as a result, power supplies are sometimes referred to as
electric power converters.
Heat Sink
A component designed to lower the temperature of an
electronic device by dissipating heat into the surrounding air.
A heat sink without a fan is called passive heat sink; a heat
sink with a fan is called active heat sink. Heat sinks are
generally made of an aluminum alloy and often have fins.
Graphics Card
A video card connects to the motherboard of a computer
system and generates output images to display. Video cards
are also referred to as graphics card. Video cards include a
processing unit, memory, a cooling mechanism and
connections to a display device.

3. Ports
A port is an interface between a computer to another
computer or peripheral devices, mainly used port is the USB
Port.
Central Processing Unit (CPU) or Processor
The central processing unit of a computer is a piece of
hardware that carries out the instructions of a computer
program. It performs the basic arithmetic, logical and
input/output operations of a computer system. The CPU is like
the brain of the computer, every instruction no matter how
simple has to go through the CPU.
Network Card
The network card allows data to be transferred between the
computer and the network.
Hard Disk Drive (HDD)
A hard disk is part of the system unit, often called as disk drive
or hard drive or sometimes hard disk drive. That stores and
provides relatively quick access to large amounts of data on
an electromagnetically charged surface or set of surfaces.
Also referred as the main storage device.
Optical Disk Drive (ODD)
Is a device that uses photo diodes to detect reflecting lights on
optic disks and uses a laser to read and write data.

4. Activity
Activity 1: Matching Type: Draw a line to and connect to its correct name of the parts.
1
2.
3.
4.
5.
6.
7.
8.
9.
10.
Random Access Memory (RAM) or Memory Card
Store data and instruction that are used by the CPU to
perform some task. These instructions are usually loaded into
RAM from secondary storage device. RAM is also used to
store instructions that tell the CPU how to work with its parts.
These instructions are usually called drivers.
Central Processing Unit (CPU)
Network Card
Ports
Power Supply
System Case
Motherboard
Memory Card
Hard Disk Drive
Heat Sink
Optical Disk Drive

5. Activity 2. Explain the purpose and function of the following system unit part. Write your
answer on the space provided.
Components Functions
System Case
Motherboard
Power Supply
Heat Sink
Graphics Card
Ports
Central Processing
Unit (CPU)
Network Card
Hard Disk Drive
Optical Disk Drive
Memory Card
Activity 3. Give the importance of the following motherboard components.
Central
Processing
Unit (CPU)
Memory
Card
Heat Sink
Motherboard
Power
Supply

6. Answer key
Activity 1
1. Memory Card
2. Hard Disk Drive
3. Optical Disk Drive
4. Ports
5. Central Processing Unit (CPU)
6. Network Card
7. Power Supply
8. System Case
9. Motherboard
10. Heat Sink
Activity 2
Components Functions
System Case The primary function of the computer system unit is to hold
all the other components together and protect the sensitive
electronic parts from the outside elements.
Motherboard A motherboard is one of the essential parts of a computer
system. It holds together many of the crucial components of
a computer, including the Central Processing Unit(CPU),
memory and connectors for input and output devices.
Power Supply Power supply is an electronic device that supplies electric
energy to an electric load. The primary function of a power
supply is to convert one form of electrical energy to another
and as a result, power supplies are sometimes referred to
as electric power converters.
Heat Sink A component designed to lower the temperature of an
electronic device by dissipating heat into the surrounding
air. A heat sink without a fan is called passive heat sink; a
heat sink with a fan is called active heat sink. Heat sinks
are generally made of an aluminum alloy and often have
fins.
Graphics Card A video card connects to the motherboard of a computer
system and generates output images to display. Video
cards are also referred to as graphics card. Video cards
include a processing unit, memory, a cooling mechanism
and connections to a display device.
Ports A port is an interface between a computer to another
computer or peripheral devices, mainly used port is the
USB Port.

7. Central Processing
Unit (CPU)
The central processing unit of a computer is a piece of
hardware that carries out the instructions of a computer
program. It performs the basic arithmetic, logical and
input/output operations of a computer system. The CPU is
like the brain of the computer, every instruction no matter
how simple has to go through the CPU.
Network Card The network card allows data to be transferred between the
computer and the network.
Hard Disk Drive A hard disk is part of the system unit, often called as disk
drive or hard drive or sometimes hard disk drive. That
stores and provides relatively quick access to large
amounts of data on an electromagnetically charged surface
or set of surfaces.
Also referred as the main storage device.
Optical Disk Drive Is a device that uses photo diodes to detect reflecting lights
on optic disks and uses a laser to read and write data.
Memory Card Store data and instruction that are used by the CPU to
perform some task. These instructions are usually loaded
into RAM from secondary storage device. RAM is also used
to store instructions that tell the CPU how to work with its
parts. These instructions are usually called drivers.
Activity 3
Central
Processing
Unit (CPU)
The central processing unit of a computer is a piece of hardware that
carries out the instructions of a computer program. It performs the basic
arithmetic, logical and input/output operations of a computer system.
The CPU is like the brain of the computer, every instruction no matter
how simple has to go through the CPU.
Memory
Card
Store data and instruction that are used by the CPU to perform some
task. These instructions are usually loaded into RAM from secondary
storage device. RAM is also used to store instructions that tell the CPU
how to work with its parts. These instructions are usually called drivers.
Heat Sink A component designed to lower the temperature of an electronic device
by dissipating heat into the surrounding air. A heat sink without a fan is
called passive heat sink; a heat sink with a fan is called active heat sink.
Heat sinks are generally made of an aluminum alloy and often have fins.
Motherboard A motherboard is one of the essential parts of a computer system. It
holds together many of the crucial components of a computer, including
the Central Processing Unit(CPU), memory and connectors for input
and output devices.
Power
Supply
Power supply is an electronic device that supplies electric energy to an
electric load. The primary function of a power supply is to convert one
form of electrical energy to another and as a result, power supplies are
sometimes referred to as electric power converters.
Prepared by:
DANILO B. AÑOS
Teacher II/ Barobo NHS