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A voltmeter would tell you that your computer is fed with 230V AC all the time, unless you have some really bad power grid around. I suggest using a wattmeter instead, although it's open to discussion.
EDIT : Ooops, someone said it before me.
EDIT 2 : Excellent research, by the way. You've found quite a lot of references to prove your point ! Edited 2011-08-03 08:38 UTC