CASE FAN:
Case fans are really inexpensive and very important for a computer. It keeps the computer components cool and it should keep as cool as possible.
POWER CABLE CONNECTORS:
It connects the power supply to the computer's drives.They also used to give power to many video cords and other devices as well.
POWER SUPPLY:
It supplies the electrical power for a computer and gives power to the motherboad,drive and other expansion cards.
MICROPROCESSOR:
The microprocessor is the brain of the computer.CPU and arithmetic/logic unit both works together to process the computer's commands.