2. SYSTEM UNIT What is system unit? Box-like case that contains computer’s electronic components
3. SYSTEM UNIT Inside view of system unit CD-ROM Power supply Case Powercables Hard disk drive Case fan CPU & fan Floopy drive Input/Output Data cables RAM Motherboard Battery
4. SYSTEM UNIT Front layer of a system unit DVD-ROM drive CD-ROM drive Zip drive Empty drive bay Floopy disk drive Power button / Reset button
6. SYSTEM UNIT Functions of the main components of a system unit 1. Power button: To start on computer 2. Motherboard: Main circuit board of the system unit, which has some electronic components 3. Power Supply: Supplying power to the computer 4. 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-RWs 6. Floppy drive: A device that reads from and writes on a floppy disk 7. Hard disk drive: Type of storage device that contains one or more inflexible, circular platters that store data, instructions and information.
7. exercise Look at the diagram carefully and match them to the name of the ports in the table given using numbers.
8. exercise Mark T for True and F for False 1. 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. ( )
