why can’t electric cars be charged by their own movement?
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When you spin the shaft of a generator/alternator, the magnetic fields inside the generator push back against your effort. The more electrical resistance between the terminals of the generator, the more the magnetic field resists in turn. The end result is that you can convert electricity into motion (a motor) or motion into electricity (a generator), but if you try to convert electricity to motion to electricity, you end up with no more electricity than you started with. This is so fundamental and unavoidable that we think it’s one of the rules written into the fabric of reality itself, which we call the Law of Conservation of Energy.
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