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Thushara Wedagedara/(+94)037-4935971/thusharaabc@gmail.com/Samagi mawatha,Wanduragala,Kurunegala,60000,Sri Lanka/Ku-Maliyadeva Model School-A/L-2007 Biology

Information & communication Technology

ICT(Information & Communication Technology)is about digital signal pass between devices. Such as computer, Phone, ect.The great and best example is the internet.Actuarly computer is the main machine to it's working.
There are different types of computers
But only one user can work at any given time.
The types of computers are

1 Desktop computer

In the world about 45% of peoples are use Desktop computers because it is very cheapness and durability.The history of desktop pcs dates back to arround the late 70s of the 20th century.In desktop computer following parts are visible for you

        1Visual Display Unit(VDU)
        2Keyboard
        3System Unit
        4Mouse

Desktop computers are designed to sit on a table.

2 Workstations
Workstation is a specialized,single user computer.But it has more power than normal pc.
They are use by engineers,scientst,video editers.Because they need more speed pcs.Im workstations their
has high resolution monitors,and speed graphic cards

3 Notebook computers

They are light weight Computers.The main deferrent between Notebook and Desktop computer is the display screen.Modern notebook computer nearly Perform like Desktop PC.They have same Cpu power,RAM,etc.But it is Very expensive than Desktop PC.Notebook computer's have battry to run the machine still not main power.

4 Tablet PCs

Tablet PC function as Notebook computer,But it can directly write on the screen.Tablet Pcs and notebook PCS are both portable PCs.
5 PDA(personal Digital Assistant)

It's call Digital diary.Its can only perform only limited tasks.It's use for storing small data.Now PDA has lost the Market with the sell phone's come.
6 Network servers

Most organitation's has Network of computer's.The centralized main computer of the netwok call Network servers.
7 Mainframe Compters

Mainframe computers use in larg organizations who need same data at many times.The devices that can access mainframe computeer's call terminal's.Dump terminal can't process or store data,Inteligent terminal can process data but can't store data.
8 Mini computers

Mini computer's can handel much input's and output's.It's more powerfull than normal PCs.
9 Super computers

It's giving very speed calculation's.They use for Graphics,Whether forcasting,and reserchas.Mainfreme computer's are use for several perposes.But super computer are use for one purpose.They are very expensive.

Now we will talk about components inside the casing

* Do you know about registers?

*They indicate how much data can computer any given time.

*More RAM become computer fast and can handle more large programmes.

*Computer internal clock is clock that run by quard crystal like modern clock...

*Commputer bus is the path between component to transfer data.Actuarly it is set of wires.More wires mean more fast.

* Cache memory is a small amount of memory that have between RAM and the processor.It is build with processor.

There are many components that have attrached to modern computers. We can devide these into three types. 1.Input devicecs -Mouse,Keyboard,Tracker ball,Touch pad,Light pen,Joysticks,Microphones,Web cams,Etc

2.Out put devices-Monitor,Projectorss,Printers,Speakers

3.Both Input and Output devices-MODEM,Etc

*There are many storage devices in computer.Acording to their needs

Internal hard disks ,External hard disks,Zip drives,Jaz drives,Diskettes,CD-Rom Drives,DVD drives1

*The main part of the computeer is processing devices.

They are CPU and the memory.

The Cpu has two parts,Controle unit and the ALU

Controle unit perfome Input output operations and ALU perfome Logical operations.

*There are two types of memory in Computer

1.Non volatile Memory-They store data even computer is unpluged.Most of them are ROM.Eg-BIOS 2.Volatile Memory-They are very fast.But store data with electricity method.Then no power,no memory.Eg-RAM