Lesson Notes By Weeks and Term - Primary 4

Computer as an IPO system





Topic: Computer as an IPO system

Subtitle: Input and output system

Learning Objectives:At the end of this this lesson,pupils should be able to:

  1. Describe the computer as input process and output IPO system
  2. Input data into the system using keyboard and mouse

Resources and materials:

Scheme of work

Online information

Instructional material: A functional computer system.

Building Background/connection to prior knowledge: pupils are familiar with the topic in their previous classes.



A computer is an electronic machine that works under the instructions given by us. In order to perform any work, a computer follows three steps: Input - Process - Output. It can accept data (Input), manipulate the data according to specified rules (Process) and produce results as information (Output). To put it more clearly:

1. The computer accepts the data that we feed into it through an input device like the keyboard or mouse.

2. The computer processes the data into information through a processor called Central Processing Unit (CPU).

3. The computer displays the information through an output device like the monitor or the printer.

Input Devices

Input :- Input is the raw data entered into a computer from the input devices. It is the collection of numbers, letters, images, etc. Keyboard, Mouse, scanner, webcam, etc are some examples of the input devices.

Devices which transfer data, programs, or signals into a computer systems are called input devices. These devices are used to give raw data to the computer to perform the specific tasks. Firstly, the data, programs, a signals are fed into the input devices in a suitable form, and are then converted by the device into electrical signals from human-readable format that are transmitted to the central processing unit of the computer


(raw data)

Input devices

> Mouse

> Keyboard

> Scanner

> Webcam

> Digital camera

> Microphone

> Joysticks, etc.

Output Devices

Output devices are used to get final result from the computer. Firstly, output is displayed on monitor. Then we can print out these outputs on a paper with the help of printer. The purpose of the output devices is to translate data and informations from electrical impulses to human-readable format.

The output device, which is necessary for the computer to display messages to the user, is a monitor. If we want to keep the copy of the work on paper, we used printers. Plotters are devices that are more suitable for the large scale outputs like engineering drawings and high quality graphics.

Output devices

> Monitor

> Speaker

> Printer

Strategies& Activities:

Step 1: Teacher revises the previous topic.

Step 2: Teacher introduces the new topic.

Step 3: Teacher explains the new topic.

Step 4: Teacher welcomes pupils questions.

Step 5: Teacher evaluates the pupils.

Assessment & Evaluation:

  1. Describe the computer as input process and output IPO system
  2. Input data into the system using keyboard and mouse


Teacher goes over the topic once again for better understanding.

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