Power supplied while a system is not fully operating.

Ratio of useful output power to input power.

Physical body surrounding connector contacts.

Conductive strap providing grounding.

Standby 5-volt rail commonly provided by ATX PSUs.

Circuit converting DC power into AC power.

Cable carrying electrical power.

Wire connecting a circuit to ground.

Power-supply output delivering approximately 12 volts.

Circuit changing voltage, current, or power form.