I am a theatre and music teacher trying some new things out my comfort zone with electronics, and have
had some success building a coupkle small DC motors but am having trouble using the motor to generate a hand crank flash light.
it runs well on 9Volts, so I hoped that if I attached the right size light bulb it would light up.
The guy in micro center told me crypticallly that i needed to do the math, but I'm not sure what he meant.
Do I need a recharagable battery, or a rectifier or maybe just a light bulb of the right size, I'm not sure
thanks in advance for anybody with thoughts to share