I'm designing a power assisted bicycle for my senior project in mechanical engineering and I have a few questions about the electric side of the design. I want to attach a small motor to be driven by the rear wheel to generate electricity to recharge the battery. The specs of the motor I was looking at are as follows American Bosch Motor/Generator -1/3 HP -24 volt DC -No-load speed 7800 RPM -No load amps 1.5 -Full load speed 5900 RPM -Full load torque 60 oz-in -Full load amps 15 -Motor body: 2.5" diameter x 4.5" long -Shaft: .25” diameter x .75” -flatted on two sides. -Two 10-32 mounting studs on front, .7” long, on 1.94” centers. -self-resetting bi-metal thermal protection. Now my question is, is there a way for me to calculate what kind of current is being generated at a certain rpm? I'm hoping there is a generic formula and its not totally dependent on the motor.