How can I find the "live" wire (household plug)? After playing with an electrical socket (with caution), I realized there is 120v between the black and ground wires. However, the white is supposed to be "live", black is "neutral", and copper is "ground". Since there is 120v between black and ground, and between black and white, it makes me conclude that the wires were not properly wired, and that the black in my cause is actually "live", while the white is "neutral". As such, is there a definite way of finding which is "live" and which is "neutral"?