Basic Computer
Computer Tutorial

Parts of Computer

Parts of a computer

All Type of computer Generaly have three functional parts.

1. Input Unit
2. Central Processing Unit ( CPU )
3. Output Unit

› Input Unit

This unit contains devices with the help of which we enter data into computer. This unit makes link between user and computer. The input devices translate the information into the form understandable by computer.

› Central Processing Unit ( CPU )

CPU is considered as the brain of the computer. CPU performs all types of data processing operations. It stores data, intermediate results and instructions(program).It controls the operation of all parts of computer.

CPU itself has following three components
» ALU(Arithmetic Logic Unit)
» Memory Unit
» Control Unit

» ALU( Arithmetic Logic Unit )
Function of arithmetic section is to perform arithmetic operations like addition, subtraction, multiplication and division and logical section perform logic operations such as comparing, selecting, matching and merging of data.

» Memory Unit

This unit can store instructions, data and intermediate results. This unit supplies information to the other units of the computer when needed. It is also known as internal storage unit or main memory or primary storage or Random access memory (RAM).

» Control Unit

The process of input, output, processing and storage is performed under the supervision of a unit called 'Control Unit'. It decides when to start receiving data, when to stop it, where to store data, etc. It takes care of step -by-step processing of all operations in side the computer.