This article is about the mammal. For other uses, see Porcupine (disambiguation) . Porcupines are rodents with a coat of sharp spines, or quills, that protect against predators. The term covers two families of animals, the Old World porcupines and New World porcupines.
An average desktop computer uses between 60 and 300 watts. It is very difficult to know exactly how much computers use on average because there are so many different hardware configurations.
A 70% efficient power supply in a computer that needs 100 watts of power to operate will actually draw 130 watts (the extra 30 watts are lost as heat by the power supply). If a new 85% efficient power supply was installed the same system would then draw 115 watts.