I would like to understand how the different variables relate on a magnetic induction generator. I would like to use this on a bicycle and see what can I power with it. Having a no-battery wireless hall sensor (for a speedometer) would be nice. Also, I can use the same magnet use for sensing for power.
However, I do not know what characteristics the coil and magnets should have, how much current I can get per unit of time, what voltage do I get, etc.