Main computer components

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Main Computer Components
Central Processing Unit (CPU)
Main Memory
Peripheral devices
Input devices
Output devices
Secondary or backup storage

It is the BRAIN of the computer.
It carries out SOFTWARE INSTRUCTIONS.
The speed of CPU is measured in HERTZ (Hz).
It has THREE parts: main memory, arithmetic
and logic unit (ALU) and control unit (CU).
Example: Pentium, AMD

Main Memory
It is the GROUP OF CHIPS inside the processing
unit.
It is also known as IMMEDIATE-ACCESS STORE (IAS).
There are TWO types of main memory: random
access memory (RAM) and read only memory
(ROM).
FOOT NOTE:
RAM holds the programs currently running.
ROM holds boot-up program.

Main Memory
RAM ROM

Peripheral devices
Peripheral devices are devices OUTSIDE
the central processing unit but under its
CONTROL.
They may be INPUT DEVICES/OUTPUT
DEVICES/STORAGE DEVICES.
Example: Keyboard, Printer

Peripheral devices

Input devices
Devices that pass data into the
computer are known as INPUT
DEVICES.
Example: Mouse, Webcam

Input devices

Output devices
Devices that take data from the
computer are known as OUTPUT
DEVICES.
Example: Monitor, Sound box

Output devices

Secondary or backup can store data in a
computer system PERMANENTLY.
It is NON-VOLATILE, so data that is stored
on these devices remains there safely.
Example: Hard disk, USB Memory Stick

Main computer components

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