PC Forums

The term power supply is a bit of a misnomer.

A PC's power supply does not actually supply any power. Just as with any electrical appliance, the power for a PC is supplied by the wall socket, which is connected to your local electrical grid., which is supplied electricity by a power company. What the power supply in a PC actually does is act as a step-down transformer. That means that it converts high-voltage alternating current into low-voltage direct current. Generally, a PC uses 12-volt current to power motors on devices like hard drives and CD-ROM drives, and 5-volt and 3.3-volt current to support onboard electronics.

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