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One of the easiest ways to think about AC or electric power generation is to think about it as the opposite of electric power use (like a Motor running backwards). Motors convert electricity into power and motion. Generators convert motion and power into electricity.
A typical Generator has a large Electromagnet spinning inside a "stationary coil" of Wire. As the Magnetic Field produced by the ends of the Magnet moves across the turns of Wire in the "stationary coil", an electric current is set up in the Wire. Increasing the number of turns of Wire in a "ring" ("doughnut") configuration increases the additive current in the Wire. There are two types of Alternating Current commonly in use today:
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