I think you’re sitting on the switch

There’s a switch marked 115 / 230 on the back of your desktop computer. What does this switch do?

A) Configures over-clocking parameters for the CPU

B) Modifies the input voltage for the power supply

C) Sets the video card refresh rate

D) Moves the USB output between bus 115 and bus 230

E) I’m not sure, but my garage door keeps going up and down

The answer: B) Modifies the input voltage for the power supply

A manually-switched power supply requires you to set the proper voltage before powering up the computer. If you move a computer from one country to another, you should make sure the switch is set properly before connecting the power! Many “auto switching” power supplies do not have a switch and therefore do not require any manual switch configuration.

Want to know more? Watch “Computer Power Specifications.”

Each PC power supply lists a number of different specifications. In this video, you’ll learn how to interpret power supply specifications and how to avoid a voltage mismatch when connecting your computer to a new power source.