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Ok, Ok, I think I can mediate here a bit. shakran and Sapper both have valid points. It all depends on how we want to define efficiency. I think Sapper interpreted efficiency as 'less costly' in an electric bill kind of sense, in which case since 120VAC and 220VAC will supply equal amounts of power to a circuit with, as one of the links shakran provides says, less than 50 feet of wiring. When the wiring (like house wiring) has more than 50 feet of wire, the line loss at 120 VAC is twice what it is at 220 VAC (purely resistive aka thermal energy loss).... shakran interprets efficiency as power supplied to power consumed. For example, if you have a motor, of which most have coils with hundreds of windings which is made of many many feet of wire, the coil losses are considerably more at 120VAC than 220VAC...one of the links mentions four times as much due to not only resistive losses, but inductive losses as well.
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