What is a personal computer ? And use of personal computer

What is a personal computer ? 

 A personal computer is a genral purpose computer which is designed for personal uses . It's size , capabilities and low cost  make it useful for  individual . A personal computer may be a desktop , a laptop , a tablet or palmtop .  It is based on microprocessor technology . Software application for personal computer include word proccessin , accountings , spreadsheet , database , web browser  and email , games and special purpose software . Modern personal computer . Often have high speed or dail up connection to the Internet , allowing access to the Internet and a wide range of other resources . A  PC may be used at home or may be found in an office . Personal computer can be connected to a LAN ( local area network ) either by a cable or wireless .


Personal computer image
Personal computer image

Also read

Devlopment of personal computer 

Personal computer were made possible by two technical innovation in the field of microelectronics viz. the intefinteg service which is devloped in 1959 and the microprocessor , which first appeared in 1971 . The IC permitted the miniaturization of computer memory circuits and the microprocessor reduced the size of computer CPU to the size of a single silicone chip . The first complete personal computer was the commodores   PET introduce in January 1977 . It was soon followed by the popular Apple  2 .  In 1981 , IBM PC was the most popular personal computer .


Parts of a personal computer

A personal computer is not a single part called the " computer " . A computer is a system that has many parts working together and each parts  has a special function .

System unit : the system unit is the main parts of computer system . It is a rectangular box placed on or under your desk that house the important parts of the computer system . It includes the motherboard , microprocessor , main memory , bus and ports , but does not include the keyboard , monitor , or any peripherals device .

System unit for personal computer
System unit for personal computer



 Inside this box are the microprocessor , disc drive and other elements that work together to do the actual computing. The most important of these components is the central process unit or microprocessor , which act the " brain " of computer . Another components is Random access memory { RAM } which temporarily stores information that the CPU uses while the computer is on .  The information stored in RAM is erased when the computer is turned off . All these functions are control by the software which make it possible for us to use computer . Almost every other parts of computer such as keyboard , monitor ,  mouse and printer connevted to the system unit cable . The cable plug in specific ports . Typically on the back of system unit . Hardware is the not is part of the system unit is sometimes called a peripheral device .


There are two type of system unit

   A desktop type system unit : the desktop system unit is a square box shaped structure which can lie flat on the desk or table and the moniter is usually placed on the system unit .


B Tower type system unit = this is another type of system unit . This type of system  unit is vertical placed on the side of the monitor . The tower model are mostly used at home and office .


Main parts of system unit : 

CPU : cpu is the most important parts of  a computer ,where actually proccess take place . It is the brain behind all personal computer . It also reffered to as a processor or microprocessor .

Following are the various types of CPU

Intel Pentium              AMD Athalon
Intel pebPent pro         AMD Celeron
Intel Pentium  3       AMD Duron
Intel Pentium 4          Cyrix


Motherboard : the motherboard is a flat circuit board on which fiber like structure of metal connecting pin are mounted . These pin connected components to each other through which data , instructions and information are transferred . These fiber like structure of metal or electronic path are called bus . The motherboard is the main circuit board of a computer on which a proccesss , video card , sound card , , IDE hard , IDE hard drive , etc are all plugged into the various slots and connection . The CPU is plugged into the motherboard through a socket or a slot . On most computer , it is possible to add memory chips. To Add additional core features, we may need to replace the motherboard entirely . 

RAM  : this is where our computer keep the information it is the using moment. RAM  stands for a memory. And information is kept here only as long as it needed by the application running on the computer .


RAM Chip Slot :  these slot are meant to expand the computer memory adding by RAM  CHips .

RAM for Personal Computer
RAM for personal computer


ROM : it is silicone on motherboard on which instructions are burned at the time of manufacturer . When computer is switch on  instructions stored is automatically initiarini and after switching it of instructions do not get lost .


Math Co processor slot : some personal computer have a slot where math co processor assist the CPU in performing in mathematical operation .


Video card :    a video card is also called video adapter , graphic card  , the function is to generate an output image to display .

Sounds card : this card enable us to pay sounds and music  . The sound card converted the digital information into electrical signal .


Power Supply :  a power supply unit is the components that supplies power to other components in a computer . A power supply unit is typically designed to convert AC form the mains to DC  power for the different components of the computer . Most components of the computer . Most component require 5 volt while the floppy and hard disk require about 12 volt .


Internal speaker : it is speaker on the computer motherboard that is responsible for beeps , beeping noise and other tones . This speaker is very basic and is not a speaker for playing songs , music , or other complex sound generated in a game .


Timer  :  it is internal clock on the motherboard which is battery operated .


Personal computer timer image
Personal computer Timer image


Expansion slot.   :  It is a long narrow connectors  Which allow us to plug in expansion card like the sound card , network card etc . The primary purpose of an expansion card is is to provide or expand on features different accessories . They are given below .

1 power socket

2 keyboard port

3 Serial port

4 Moniter port

5 parallel port

6 audio jack

7 network port

8 USB

9 SCSI ( small computer system interface) port



Hard disk :  it is a hardware device which stores   all programme and data in the computer . So it's reffeer to as the memory  bank of computer turned off . Larger the hard disk capacity , more amount of the program and data that can be stored in it . In nearly all case , it is permanently installed in the system unit and stored both the software  the computer uses and the data file the user create .



CD drive :  cd drive is a device that enables us to read and stored the information on CD disk  . It is usually located on the front of the system unit . CD drive use laser to read data from A CD .

Floppy disk drive :  floppy disk drive is a device that enable us to read and store the information on floppy disk , also called floppy or diskette . They also retrieve information more slowly and are the more prone to damage .

Monitor  : is the part of computer that look like a small  TV and shows you what is going on . Usually it has two cords  , one for power and the other for the connecting system unit . It displays text character and graphics in grey shed or in colors .

Mouse : it is an input device and it used to point and select item on your computer screen . By sliding the mouse around on a flat surface ( usually on mouse pad ) the user moves ( a single or double click ) to select the item . A single cord connection the mouse to system unit .

Mouse image for personal computer
Mouse image for personal computer 



Keyboard = it is a typewriter which contains keys to feed information into the the computer . It is attached to the system unit with  a cord . The standard and IBM keyboard have 83 keys but enhanced keyboard has 104 keys.

Speaker =  it is an output device . When the  speaker is  connected to the sound card , the output as a sound can be heard on the speaker . Often it is  used for entertainment .

Printer : it is an output device that produce print of image such as number , alphabet , graphs etc. On paper or hard copy which is called printout .

Scanner : it is an inputs device that transferred typed or handwriting  texts , graphs , diagram , and photograph to the computer in digital form .

CD ROM Drive : CD ROM drive is a device that read the information stored on CD ROM.  CD ROM is an abbreviated terms for Compact Disk  Read Only Memory . The information stored in CD ROM can neither be changed nor can new information be added to it .

CD Writer :  CD - writer that reads and writes the information from CD .

Modem :  it is short form of modulator - demodulator . To connect our computer to the Internet , we need a modem . A modem is a device that sends and receive information over a telephone line or high speed cable .





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