I'm learning AC and theory says that the polarity of AC inverses.. even the name says 'alternating current'.. now what about the live and neutral? does the current goes from neutral to live and and vice versa? Some people says that only the phase inverses, but the current is always from live to neutral, and direction of current never inverses.. Is all these true?? can someone help me understand all these?? and why do transformers has only one color for both wires? like, transmission transformers also are pretty much same, i mean same principle.. i'm so confused..