I am sorry if this may seem like a beginner question (which I am not) but the I find the best way to learn something is to understand it from it's most basic components or operations first. In this spirit I have a question regarding the relationship between voltage and current in AC circuits. Voltage is defined as the energy required to move an electric charge from point A to point B (divided by the magnitude of the charge). In DC current when two wires are connected to the leads of a battery, the electron flow (not to confuse with the conventional current) is from the negative lead, or the most negative voltage to the positive lead or the most positive voltage. Along the way, the electrons move through the wire and dissipate their energy (voltage or eV) in the components they encounter in the circuit so when they arrive at the positive lead they will have no more energy or voltage. This part is clear. The thing I don't understand is in AC current. AC current being the come and go of electrons in the wire, they actually always end up in the position they started. I was wondering then, where does the voltage to move the electrons come from. In other words how is the voltage from the turbine at the electrical central transferred to the electrons present in the wall socket of my house since these electrons basically never reach the turbine. They seem to move forward and lose energy and then coming back losing some more in the other direction without recuperating it anywhere. Thank you I am sorry if it is not clear enough don't hesitate to tell me.