Invisible wrote:
> OK, so what *is* the correct mains voltage in the UK?

A related question. why do some countries use 110 and others use 220?

BTW, here in the US I've seen AC voltage expressed as 110, 115 and 120. 
  Generally it's actually somewhere between 105 and 125, devices get 
around this by having voltage regulators. e.g. if the input voltage 
sags, it'll draw more current to keep the output voltage where it wants 
it to be, and vice-versa.. Of course there are limitations, and 
eventually the regulator will output too little voltage, because the 
supply cannot keep up with the current draw, or it'll burn out because 
the input voltage is outside it's operating limits.

This is why battery operated electronics can run until the battery is 
almost flat, even though the battery's voltage continually drops as it's 
drained.

-- 
~Mike

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