Pedal Power
How to build a pedal powered bike?
I'm doing a project all about going green, so i thought that our project could be about pedal power. i know i need a bike (well duh 
) but i need to know how to put the bike together with a generator and all that so i can light up a light bulb ;D. thanks a bunch !
You can get 'bottle' generators that press up against your tire, or you can buy hubs with generators built in. Bottle generators mount on a seat stay, or sometimes behind the bottom bracket on the underside of the bike. Either way, spinning the wheel generates electricity. Then you get a headlight and tail light that are made to work with whatever voltage the generator puts out, typically 6 volts. BTW, since an AA or a C cell is 1.5 volts, any light bulb meant to be powered with 4 batteries could also be powered by a 6V generator. LEDs are another matter, though; since a generator produces AC voltage and LEDs require DC voltage.
Whichever type of unit you use, your system should incorporate a circuit for controlling the voltage, as output will vary depending on how fast you ride and going too fast will burn out the bulb.
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