Hey, I am looking to build a generator that goes on a bike stand so when i ride my bike on the stand it will produce electricity. Im planning on having a copper coil with magnets inside spinning. This is a dc generator right? Well, anyways... i know if i spin the magnets faster it will produce more electricity. Can i increase the amount of copper in the coil in order to produce more electricity? Like if my coil is 500 ft long and i have 2 1" x 3" x 1" rectangle magnets spinning at 100 rpm i should produce x electricity. If i spin faster will i get a higher voltage or amperage? How much more electricity can i produce if my coil is 1000 ft long and i use the same magnets and same 100 rpm?