1# Hardware                       2# User              3# Software                    4#Data

1:Hardware

All touch able part of computer is called hardware.

 System Hardware of four types namely

i) CPU                   ii) I/O devices                       iii) Memory                     iv) Storage

i) CPU

(Central Processing unit )

CPU consist of two main parts CU  ( control unite) and ALU ( Arithmetic Logic Unit )

CU: (Control unit)

CU directs and coordinates most of the operation in computer. It performs functions by giving command to respective unit of the computer.

ALU: (Arithmetic logic unit)

ALU handle all Arithmetic Comparison (i.e mathematical operation Addition subtraction as well as logical operations) etc

Hours work <40

10+20=30