I am planning to convert an exercise bike to a power generator in the   
   following way: the belt of the exercise bike drives a hub which has the front   
   sprocket of a mountain bike attached to it. A bicycle chain drives a standard   
   six speed sprocket (gear)    
   set and derailleur of a mountain bike attached to a hub which also drives a   
   power generator. My ideas that I could switch gears if I wanted a higher   
   workout. I hire work out at a lower gear would mean that the power generator   
   turns faster. So here are my    
   questions: since I'm charging a 12 V battery the power generator cannot output   
   of a higher voltage but must output more amperage when it turns faster. can   
   anybody recommend which cheap power generator I should buy which changes   
   amperage not voltage with    
   higher rotation speeds? What else do I need? Thank you very much for your   
   input.   
      
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