The document outlines the main components of a computer including the input unit which takes in data and programs, the memory unit which stores data and programs in both primary and secondary memory, the arithmetic logic unit which performs arithmetic and logical operations, the control unit which controls data and instruction movement, the central processing unit which executes stored programs, and the output unit which delivers results to the user.

2. 1. Block diagram of a computer
2. Input unit
3. Memory unit
a) Primary memory
b) Secondary memory
4. ALU
5. CU
6. Central processing unit
7. Output unit

3. BLOCK DIAGRAM

4. It reads the data and program into the computer.
The program contain instruction about what has
to be done with the data.
It provide a way of man to machine
communication.
Input Unit

5. Memory
• Primary -Internal
• Secondary: External

6. It performs the arithmetic & logical
operations on the data as a result of the
execution of the decoded instruction.
Arithmetic Logical Unit

7. It is responsible for the movement of data
& instruction in and out of the memory
and CPU.
Control Unit

8. The purpose of CPU is to execute the
programs stored in the main memory.
Central Processing Unit

9. These devices are required to deliver
results to the user of computer system.
This unit provides a way of machine to
man communication
Output Unit