Introduction of  Computer

Computer is an electronic device which accept input, store it, process on it and give desire output.

A personal computer (PC) is a computing device made up of many distinct electronic components that all function together in order to accomplish some useful task, such as adding up the numbers in a spreadsheet or helping you write a letter.

Functions of a PC

Ø  Accepts data input from user

Ø  Stores data

Ø  Processes the input using instructions

Ø  Displays processed data on output devices

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Input Devices

Used to enter data in computer

Different types are:

ØKeyboard

ØPointing Devices

ØScanner

ØDigital Camera 

Output Devices

Ø  Used to display or produce processed data

Ø  Monitors and printers used to display output

Ø  Different types of output devices are:

ØDisplay System

ØDisplay Card

ØSound Card

ØPrinters

ØFax 

Storage Devices

Used to store data in the computers

Different types of storage devices are:

ØMagnetic Devices – Floppy, Zip drive

ØOptical devices – CD, DVD

ØSolid-State Storage devices – Flash memory, memory cards

ØDigital Audio Tape

Processing Devices

Computer main function is to process data

Various types of processing devices are:

ØMicroprocessor

ØChipset

ØBIOS

Communication Devices

Establish communication between computer using different cables, interfaces and wireless devices

Various types of communication devices are:

ØInterfaces – ATA, SCSI

ØI/O Ports and Cables – Serial, Parallel, USB

ØLAN Card

ØModem

ØNetwork Cables – STP, UTP, Fiber Optic Cable 

Infrastructure Devices

Refers to main components and foundation on which computer functions

All the peripheral devices of the computer are attached

Various types of components are:

ØSystem Case

ØPower Supply

ØMotherboard

ØExpansion Boards 

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