power hit(Or "power glitch") A sudden increase (spike) or decrease (drop-out) in the mains electricity supply. These can cause crashes and even permanent damage to computers. Computers and other electronic equipment should really include some kind of over-voltage protection in its mains input to prevent such damamge. [Jargon File]
powerdomain ♦ PowerFuL ♦ power hit ♦ Power Mac ♦ Power Macintosh ♦ power-on reset
Try this search on Wikipedia, Wiktionary, Google, OneLook.