5K40.85 - Back Torque - Conversion of Mechanical to Electrical Power
Demonstrate the back torque created while mechanical energy is converted to electrical energy.
The mounted hand crank generator with a light bulb socket connected to its terminals is clamped to the bench. The bulb is unscrewed and someone, lecturer or student, cranks the generator fairly easily. But, if the bulb is screwed in while the generator is being cranked, it suddenly becomes far more difficult to turn the crank. 50 watts is a good compromise between obtaining a noticeable back torque and also a noticeable glow from the lamp.