Switch with a twist

What does the small switch on a computer power supply provide?

A) Controls the speed of the CPU

B) Sets the voltage used by the power supply

C) Sets the cooling fan speed

D) Boots from different operating system partitions

E) Fires a small confetti cannon. Yay, Windows!

The answer: B) Sets the voltage used by the power supply

A power supply voltage switch allows you to manually configure the power supply to work on 115V or 230V. If the computer is moved between countries with different power requirements, the computer power supply can be configured to work in either situation.

Want to know more? Watch “Computer Power.”

Without the supply of power, your computer won’t have much to do. In this video, you’ll learn about power supply standards and how different connectors are used to power the components inside of modern personal computers.