SYSTEM UNITPrepared by: masniza mustafa

SYSTEM UNITWhat is system unit?

Box-like case that contains computer’s electronic components

SYSTEM UNITInside view of system unit

Power supply

Powercables

Case fan

CPU & fan

Input/Output

RAM

CD-ROM

Case

Hard disk drive

Floopy drive

Data cables

Motherboard

Battery

SYSTEM UNITFront layer of a system unit

DVD-ROM drive

CD-ROM drive

Zip drive

Empty drive bay

Floopy disk drive

Power button

Reset button

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SYSTEM UNITInput/Output port (I/O port)

SYSTEM UNITFunctions of the main components of a system unit

1. Power button: To start on computer2. Motherboard: Main circuit board of the system unit, which has some electronic components3. Power Supply: Supplying power to the computer4. DVD-ROM drive: A device that reads DVD-ROM, also can read audio CDs, CDROMSs,CD-Rs and CD-RWs.5. CD-ROM drive: A device that reads audio CDs, CD-ROMs, CD-Rs and CD-RWs6. Floppy drive: A device that reads from and writes on a floppy disk7. Hard disk drive: Type of storage device that contains one or more inflexible, circular platters that store data, instructions and information.

exerciseLook at the diagram carefully and match them to the name of the ports in the table

given using numbers.

exerciseMark T for True and F for False1. The processor (CPU) interprets and carries out the basic instructions that operate a computer. ( )2. Computers can use only one processor at a time. ( )3. ROM is the main circuit board of the system unit. ( )4. Expansion slot is a socket on the motherboard that can hold an adapter card.( )5. RAM is non-volatile. ( )6. The most important chip on the main circuit board is the microprocessor chip. ( )7. I/O port is the point at which a peripheral attaches to a system unit so that the peripheral can send data to or receive information from the computer. ( )8. Reset button is to start on computer. ( )9. A device that reads from and writes on a floppy disk is called hard disk drives. ( )10. Power supply convert standard electrical power into the form that computer can use. ( )