Lesson Notes By Weeks and Term - Junior Secondary School 2

SUBJECT: ICT

CLASS:� JSS 2

DATE:

TERM: 1st TERM

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WEEK 3

TOPIC: HARDWARE

Hardware is any part of the computer that you can physically touch, pick up, hold, and move around. In other words, hardware are the physical parts that make up the computer�

Components of computer hardware: These includes�

1. Input device
2. Output device
3. Storage device
4. Arithmetic logic unit�
5. Control unit

Input device: This device is used for entering data and programs into the computer system by the user for processing. �Input device is divided into to types, these are:�

1. Manual input device
2. Automatic input device�

Examples of input device are:�

1. keyboard�
2. mouse�
3. joystick�
4. graphics tablet�
5. trackball�
6. touchpad�
7. touch screen�
8. microphone�
9. sensor
10. Scanner
11. Web cam

Output device: Output devices are pieces of hardware that send usable processed information out of the computer.�

Examples of output device are as follows

1. printer�
2. monitor�
3. touch screen�
4. plotter�
5. speakers�
6. headphones�
7. Media projector

TYPES OF OUTPUT DEVICE

1. Temporary Output Devices - E.g. Monitors which constantly refresh the outputted image on the screen�
2. Permanent Output Devices - E.g. Printers which output information onto paper as a hard copy.

Storage device: The storage device is used for storing data and instructions before and after processing. This includes devices such as hard disk drives and compact disk drives.

Arithmetic Logic Unit:� It performs arithmetic functions like addition, subtraction, multiplication, division and also logical operations like greater than, less than and equal to, are carried out.

Control Unit: Controlling of all operations like input, processing and output are performed by control unit. It takes care of step by step processing of all operations inside the computer.

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