That is actually how we generate most of our electricity. A rotating magnet forces electrons through a wire. However, we do need something to rotate the magnet. This is often done with a turbine of some kind. With wind power, the blades are actually rotating a magnet to push electrons through the wire. Magnets are also popular for use in bicycle lights. Instead of using batteries, one can attach a rotating drum (with magnets inside) to the wheel and use pedal power to run the light. It makes the bicycle a little slower than normal, but it works quite well. I have one from about 1965 that is in perfect working order. Some generator lights are still being made, but they are hard to find because many people prefer battery lights. Before people used magnet generators, they would use carbide lamps for riding at night.
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