Quote Originally Posted by tikiroom
General rule of thumb of electricity. If you double the voltage and the resistance (or load) stays the same, then you also double the amperage. Maybe this is why it's more efficient at 220v.
You need to check this Tiki.....

....where I live if you double the voltage and the resistance (or load) stays the same you wind up with half the amperage.

But it is correct that most items, like electric motors, are more efficent at 220v versus 110v.

OM