Does the current that acts on an electrical device through my plug go back and forth? If so, why does the device rotate in one direction?

The alternating current that is generated comes through a coil and a magnet. As the magnet approaches the coil, a voltage is created, you get the zero point and then a voltage is created again. The electrons on L1 go one way and on the 0 the other way. But then the electron flow in my house also changes direction every time, or do you only get the plus of the L1 each time? I really want to understand this now.