Created by :-Amitha Priyashan

INPUT
OUTPUT
STORAGE
and

PROCESSING.

Input Devices

  

       The devices which are used to input necessary data and  

Information to a computer is called as input devices. Some

of them are,   Key board

                      Mouse

                      Microphone

                      Scanner

                      Barcode Reader

                      Joystick

                      Web Camera

                      Light Pen

                      Pen Drive etc…

Output

     The devices used to get processed data and information

 out are output devices. We can get an out put through two

 ways. They are soft and hard.We can get softout put from

monitor,projector,speaker and pen drive etc…. We can get

hard outputs from machines like printers.  

Processing

            Processing units can also named as Central

Processing Unit. It can be devided into three parts.

·      Control Unit

·      Arithmetic and Logic Unit

·      Memory Registers

Control Unit

All the controlling of the computer is done by thisunit. This controls all  the devices of the computer giving therequired commands when necessary.

Arithmetic Unit

This performs all kind of arithmetical calculation

and logical operations.

             Memory Registers

The memory registers are included in the processing processing unit and it stores the data which are ready to the Central Processing Unit for calculation or processing.

Speed of a Computer

            Speed is also called as clock speed.The unit is hertz (Hz) . Mega hertz(MHz), Gega hertz(GHz) are used to measure speed of modern computers.

1000HZ    =  1kHZ

1000KHz  =  1Mhz

1000MHz  = 1GHz

        The maximum Bits used for calculations or storing at a time is considered to measure the capacity of the Central Processing Unit. This is also called Word Size of the computer.

Storage Devices

          Storage Devices which are used to store data and

information are also called Backing Storageand

 ExtraMemory. Some of those devices are,

·      Hard Disks

·      Compact Disks

·      Digital Versatile Disks

·      Pen Drives

THE END