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I've built things like you are talking about and the first law of thermodynamics is what got me as well, granted I was only 15 at the time, but the stuff I made worked perfectly... aside from my lack of understanding in physics at the time, I have gone on to build alot of things that really do work, so it wasn't just my incompetence.
A high output alternator requires a higher input as well, if the input was the same then we would all be using high output alternators.
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