System Unit

What is System unit?The computer system unit also known as

the computer case is an enclosure that houses most of the components of a computer including the motherboard, input and out put ports, power supply unit and buttons.

The system unit is at times erroneously referred to as the CPU.

Parts of System UnitChassis (Case)MotherboardCPUCD-ROM, and DVDHard driveRAMSound cardVideo card

ChassisAlternatively referred to as

the computer case and sometimes referred to as the system unit or base unit,

the chassis is the housing that helps protect and organize all the components that make up your computer.

Why do we need a computer case?

Most people overlook the computer case as just a box, but it does provide the below important features.1. Structure2. Protection 3. Cooling4.  Noise5.  Aesthetics

1. Structure - The case is what holds everything together in a compact and organized fashion.

2. Protection - Without the case, each of the sensitive components within the computer would be vulnerable to dirt, foreign objects, kids, animals, as well as electrical interference

3. Cooling - The case helps keep the air properly flowing over all components, which keeps everything cool and running properly.

Why do we need a computer case?

4. Noise - Many computers and components have fans that generate noise. Having those components within a confined case reduces the overall noise.

5. Aesthetics - Although some may disagree, most people would rather look at the case instead of all the circuit boards, wires, and all the components of a computer.

Computer cases

1. Desktop2. Slimline3. Mini-sized tower4. Mid-sized tower5. Full-sized tower

Computer Cases

Motherboard The motherboard is a printed circuit board that is

the foundation of a computer and allows the CPU, RAM, and all other computer hardware components to function and communicate with each other.

Model ECS G31T-M7

The motherboard's main job is to hold the computer's microprocessor chip and let everything else connect to it.

USB Universal Serial BusAGP Advance or Accelerating Graphics PortPCI Peripherals Components InterconnectISA Industry Standard ArchitectureCMOS Complementary Metal Oxide SemiconductorIDE Integrated Drive ElectronicsCD-ROM Compact Disk- Read Only MemoryFDD Floppy Disk DriveHD Hard DiskSATA Serial Advance Technology AttachmentRAM Random Access MemoryROM Read Only MemorySDR Single Data Rate ZIF Zero Insertion ForcePGA Pin Grid Array

CPU – Central Processing Unit

The CPU is the central electronic chip that determines the processing power of the computer.

he processor is placed and secured into a compatible CPU socket found on the motherboard, and because of the heat it produces it is covered with a heat sink to help keep it cool and running smoothly.

Examples

RAM – Random Access memory

Memory – Memory is the part of the computer that temporarily stores applications, documents, and stem operating information.

Example RAM: DDR 1, DDR 2, DDR 3

Hard Drive

Alternatively referred to as a hard disk drive and abbreviated as HD or HDD, the hard drive is the computer's main storage media device that permanently stores all data on the computer.

Power Supply A power supply changes normal household electricity into electricity that a computer can use.

Other System Unit Parts

1. Bus – A bus is an electronic line that allows 1s and 0s to move from one place to another.

2. Expansion Slots – Expansions slots appear on the motherboard. They are sockets into which adapters are connected.

Cont.…

4. Ports and Connectors – A port is a connector located on the motherboard or on a separate adapter.

5. Bays – A bay is a space inside the computer case where a hard drive, floppy drive or CD-ROM drive sits

6. Sound Components – A sound card lets a computer play and record high quality sound.