TOPIC:

ID Code: K4-06
Purpose: Demonstrate that the generator is producing electrical energy, and that the capacitor stores electrical energy.
Description: The capacitor is charged up by cranking the generator. The generator is then run as a motor by energy stored in the capacitor.

Ask your students the following brainteaser question: If you charge the capacitor by cranking the generator, what will happen when you stop cranking and release the handle of the generator: (a) It will continue to rotate in the same direction, (b) It will rotate in the opposite direction, (c) It will remain at rest. See if you can get away with this one: Crank the motor/generator, charging the capacitor. Release the generator handle so that the capacitor causes the motor/generator handle to rotate. Suggest that a capacitor stores rotation.

Availability: Available