A generator is basically an engine like you see in a car. The gasoline is combusted/exploded in a controlled and frequent manner that causes motion in the cylinders. The cylinders are attached by some mechanism to something that spins. Where a car transfers this spinning motion to a wheel , the generator basically uses then opposite of an electric motor to create an electric current. One major property of electricity and magnetism is if you have a magnet (or several) moving continuously near a wire (the exact conditions are a bit more complex) a continuous electric current will be produced.
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