# Lesson Notes By Weeks and Term - Primary 5

Classification of computers

WEEK 4&5

SUBJECT: INFORMATION COMMUNICATION TECHNOLOGY

TERM: 1ST TERM

CLASS: PRIMARY 5

TOPIC: Classification of Computers

BEHAVIORAL OBJECTIVES: At the end of the lesson, pupils should be able to:

1. LIST COMPUTER by size
2. Mention the different sizes of computers

CONTENT

Classification Of Computers

Computer can be classified or typed in many ways some common classifications include;

• According to Size
• According to Type
• According to Purpose

1) Classification By Type

THERE ARE THREE TYPES OF COMPUTERS IN USE TODAY

NAMELY;

1. Analogue computer
2. Digital computer Hybrid computer.

Analogue computer

Analogue computers are either electronic or hydraulic devices that are designed to exploit mathematical similarity between physical interrelationships in certain problems instead of numeric, to process their data.

FOR INSTANCE: Imagine a computer that receives current as input then converts it in to voltage which may now be added or multiplied and sent to other devices for a specific purpose. The term analogue means ‘‘continuity’’ of associated quantity like an analogue clock measures time by means of the distance travelled by the hand of the clock around a dial.

Examples

• Speedometer
• Analogue clock
• Tire pressure gauge
• Thermometer

1. Store images
2. Sound, motion pictures
3. Devices and media that represent.

• Complexity
• They were very complicated for containing output for the users some time.

DIGITAL COMPUTER

Digital computer solves problems by performing calculations and by dealing with each number digit by digit. Every things that a digital computer does is based on one operation .The ability to determine whether a switch or ‘‘gate’’, is open or closed that is, the computer can recognize only two states in any of its microscopic circuit on or off, high voltage or low voltage. Using the binary system of numbers where there in only I and O,

1 stands for on and O stands for off. The speed at which the computer performs this simple act however, it is what makes it a marvel or Modern technology.

Examples

• Digital watches
• Calculators
• Apple Macintosh etc.

HYBRID COMPUTER

Hybrid computer contain elements of both digital and analogue computer. They are usually used for problems in which large numbers of complex equations, known as Time integrals, are to be computed.

Examples

• Devices used in petrol pump.
• They are used in the hospitals to measure the heartbeat of patient.
• Hybrid machines are generally used in scientific applications or in controlling industrial processes

EVALUATION

• Give more examples of analog computers.
• Give more examples of digital computers.
• Name other hybrid computers that you know