Hi, everybody, Can anyone tell me how the AC current works? I know that it uses two wires, hot and neutral, and, sometimes, the third one, ground wire. I read that the current flows from hot to neutral, but after looking at the sinusoid shape of the AC graph I was pretty much confused. Doesn't it mean that the polarity of the wires changes 50/60 times per second? If it does, then how can we say that the current flows from one wire to another, if its direction currently reverses? Also, in the US one of the slots in the outlet is wider (neutral), than another one (hot), but many European countries use the outlets with two identical slots, or holes. Why is it made in this way?