This article is a very good read about power supply efficiency and what Google is trying to do to improve the quality of the average PC power supply. More power to them!
I’ve long wondered why we don’t have a centralized source of 12V or so in the average home. Electronics generally don’t require high voltage, and having each device do it’s own (inefficient) voltage-conversion is just wasteful.
The wiring would have to be thick enough to make sure that the transmission losses are negligible; at 12V that might otherwise be an issue even over short distances. I wonder if that would make such a system prohibitively expensive.
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