According to Wikipedia, the first electrical motor was a homopolar motor. "Its operation was demonstrated by Michael Faraday in 1821 at the Royal Institution in London." I have to admit I'm with Insane Clown Posse on how they work, but you can easily make one at home with a few simple parts, as shown in this video by DaveHax.
How to make homopolar motor with just a few parts
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