Hello. I've been reading numerous texts about mains electricity but I'm not getting some of the things. I'll start with some questions, considering Live, Neutral, and Ground wires. 1) Does the neutral wire return/come from the supply company? In that case, where does the company connect the neutral wire? I ask this because I've heard/read that "ground closes the circuit", asi if, the could have a grand neutral grounded wire, and an "independant" live wire. I have serious doubts about that. 2) What does it mean that neutral wire is at zero potencial? OK, voltage is about differences. So when the wire is not connected to an appliance, say a bulb, it has a zero potential (conductor in equilibrium), but when it is conected, I asume it oscillates, and the voltage drop will be such that RMS is zero. Is that correct? Sorry for not writing the questions clearly, I think I have a big mess up about this, so any comments, or a diagram with WHERE DO WIRES COME FROM AND GO TO, including the supply company will be of great help. Thanks in advance to everyone.