资料来源 : Free On-Line Dictionary of Computing

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}]