The power supply unit converts electricity from the wall outlet into the type of power the computer needs. It sends power to the motherboard and other components through cables.

If you open your computer case, always unplug the computer first. Before touching any parts inside, touch a grounded metal object to release static electricity. Static electricity can damage the computer's circuits.
Other lessons are:
- What is the motherboard in a computer?
- What is a Processor/CPU in a computer?
- What is a RAM (Random Access Memory)
- What is a Hard Drive in a computer?
- What is a Expension Cards in a computer?
- What is a Video Card in a computer?
- What is a Sound Card in a computer?
- What is a Network Card in a computer?
- What is a Bluetooth Card (or Adapter) in a computer?