Duduli

The data & instructions entered into the computer system through input units have to be stored inside the computer before actual processing starts similarly the final results of the computations are also needed to be stored on to memory before passing them to the output units.This storage component of computer is known as memory unit.

It is the nervous system of a computer. Control unit generates the electrical signals to control & co-ordinate the functioning of other units. It tells the input unit when to feed data into the memory. It tells the output unit when to accept data from memory & supply to user. It also tells arithmetic logic unit (ALU) when & what to be done with data.

This is main processing unit of computer it may be called as “Brain of computer ”. All the operations on data are performed by this unit. It consists of 3 parts a) Arithmetic logic unit (ALU) b) memory unit (MU) c) control unit ( CU )

The data & instructions entered by the input unit is processed by CPU after processing, result must be supplied to the user this task is done by output unit. Thus job of the output unit is reverse to that of input unit. It gives result to the outside world & it also links the computer with external environment. Some example of output devices are visual display unit (VDU) , printer , Graph plotters , card punch  , paper tape punch etc.

It is the part of computer through which user communicates with the computer. In other words input unit acts as an interface between user & computer for any type of computation to be performed through computer data/command/instruction must be entered to it. This task is carried out by input unit or device.   e.g  Keyboard,mouse, light pen, joystick, punch card reader, touch sensitive screen