Think of it like an opposite fan. Instead of usuing electricity to move the fan blades the wind moves the blades to create electricity.
It is the exact same concept as a regular fan just amped up and used the opposite way.
Edit: To add to this you could convert an ordinary fan into a wind generator with nothing but a couple wires and a battery. It would not produce near enough power to have much purpose but it is the exact same concept.
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