What is Computer? What is the basic stucture of Computer?

COMPUTER

A Computer is a fast and accurate electronic machine or data manipulating system that is designed and organised to automatically accept and store input data, process it and produce output results under the direction of a detailed step by step stored set of instructions. Computer system comprises of input unit + processor + memory unit + output devices.

BASIC STUCTURE OF COMPUTER

Computer consists of three units :-

1. Input Unit

2. Central Processing Unit

3. Output Unit

INPUT UNIT

The purpose of input devices is to accept the information supplied to the computer which is required for solving the problems. The range of input devices is large as follows:

• Keyboard
• Mouse
• Joystick
• Optical Recognition Input
• Scanner
• Digital & Web Camera
• Digitiser
• Touch Screens

CENTRAL PROCESSING UNIT

It is the maine component of the computer hardware system. It consists of four units :-

1. Primary Storage
2. Arithmetic Logic Unit
3. Control Unit
4. Output Unit

Primary Storage Unit : This is the main storage area. It's main functions are - Holding the data in its memory till it is required to be processed; Holding the result of the processed data and Holding program instructions which are required for processing.

Arithmetic Logic Unit : This is used for the most of the logical processing, for example for calculations or comparisons. The arithmetic operations like +, -, *, & / are performed here. The logical operations like <, >, =, <=, >=, and <> are also performed here.

Control Unit : The control unit controls the flow and manipulation of data and information. It also control the flow of data from input devices to memory and from memory to output devices.

OUTPUT UNIT

These are those devices on which we get the output of our problems which were given through the input devices. The common output devices are given below -
1. Monitor & Displays
2. Printers
3. Plotters