Hi there, I am a teacher and will be teaching the topic of alternating current soon. I have not taught this before and have certainly not studied this in many years so I am trying to get a full understanding and am looking for a bit of clarification. So I know that the current supplied by the mains is alternating current and that this means the current is flipping direction many times a second and that consequently this has an associated frequency. Presumably this would mean that in a circuit the current would be flowing in one dirrection through the wires and components one moment and then flowing the opposite direction another moment. The main problem I am having is understanding how this works with the neutral and live wires. The live wire supplies 230V and carries the current into the appliance. The neutral wire returns the electricity to the generator after it has passed through the appliance. The neutral wire completes the circuit and the neutral wire is at approximately zero volts. If the current is alternating then how is this consistant with the fact that the current only enters an appliance from one direction (from the live wire) and exits it through the neutral wire? Wouldn't this be a direct current? I have probably made a lot of mistakes in the question and my apologies for this, just trying to to get a better understanding. Thanks for any help you can provide.