I'm having a hard time finding a starting point for this question. I'm looking for all the variables that can effect the amount generated by induction, and then hopefully ordering them from the most important to least important. Any references to a good starting point for someone who hasn't worked on physics in a long time would be great. But a simple, detailed explanation would also be nice. How do the following variables effect the power output? Velocity Force Input Size and/or mass Materials If the same materials are used, does power scale pretty directly (linearly) with the size of a generator? Will a lower velocity, but higher mass that inputs more force output more power? And do the materials basically convert the input force to output electricity at different efficiencies? For something like the Windbelt (https://en.wikipedia.org/wiki/Windbelt), is it more useful for the "rotor" to move back and forth faster, or is it more useful to add more force to it? I'm assuming velocity is the main factor, but for electric-generating bikes, I suppose it is the gear system that allows greater force to be turned into greater velocity. In that case, if you could modify force into velocity, could you use something like a giant pendulum and seismic waves to produce large amounts of power due to the sheer force between the two?