Please clarify my doubt In terms of AC line. There are hot(main) line and neutral line. 50Hz nothing but 50 cycle per second. each cycle contain half pasitive and half negative cycle. As we know in the Postive cycle hot(main) line carry +230 Voltage. my question here. which line carry or cause of -230 Voltage in Negative cycle? if it is hot(main) line, below statement also true. so, in the positive cycle current flow from hot line to neutral line ,and in the negative cycle current flow from neutral line to hot line because of potential difference. we also know that electron flow opposite to current flow. finally, you have to say agree or not with my statement. if you not ,please explain me.