Cecil says that “If volts in exceeds volts out by more than a certain percentage, that means some of the current is taking a detour,…”
He’s right about these things comparing currents, but they are in “amps”, NOT “volts”. I doubt if any GFIs measure volts of any kind!
If we’re supposed to be talking everyday technical matters, (we’re not talking about the more controversial aspects of nuclear physics) let’s at least get the simple basics right.
By the way - I think the “percentage” bit is probably not right either. The thing needs to trip as soon the discrepancy in current exceeds the human danger level, (about 50 milliamps) irrespective of the total current being used by the hairdryer or whatever.
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