Classwork Series and Exercises {Computer Studies}: The System Unit

Computer Science JSS 1 Week 2

Topic: The System Unit

System unit is metallic box that contain the major components of the computer. It contains the heart of the computer system called the central processing unit (CPU). The central processing unit is where all the processing function takes place on the computer system.

 External Features Of System Unit

1. Power button: Power button is used to turn on or turn off the computer system
2. Power light: Power light show the status of the system by coming up when the system if turn on and also it turn off when the system if being turned off.
3. The Rest Button: The rest button is used for restarting of the computer system
4. The Drive: The drives are the point where storage devices like floppy disk, compact disk are being inserted.
5. The Ports: The ports are the point at the back of the system unit where external devices such as mouse, keyboard, e.t.c are being connected.

Components of the System unit

1. Internal power supply: The system unit draws power from the alternate circuit/current (AC) through a power protecting device. The power is supplied directly to internal power supply which convert the alternate into direct/current (DC) of 5 and 12 volts. Internal power supply (SMP) it provide cable connectors to supply the required voltage to the other internal component like the floppy disk drive, hard disk drive, the boot and external device like keyboard. The off/on of the system unit is part of switch mode power supply (SMP)
2. Exhaust Fan: exhaust fan is a small fan attached to the switch mode power supply to cool it. The fan rotate as long as the computer is on
3. Speaker: speaker is an output the project out the sound of what we do with the computer.
4. Mother Board: Mother board is large board that contains numbers of tiny electronic circuit and other component. It is popularly referred to as BORAD its component are

• Micro Processor: The micro processor, processes data and produces out result. The means it accepts data, perform arithmetic and logic operation and then send out the result. It control, it responds to request for the peripheral devices e.g printer signal can indicate when it has paper run out of paper. micro processor consist of control unit, arithmetic and logic unit and register, during the arithmetic and logic unit operation, the micro processor chip hold it intermediate resulting register.
• The Register: The registers are part of microprocessor chip meant for storage and are not accessible to the programmer.

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