5K40.81 • Motors and Generators: Coupled Hand-held Generator & Flashlight

Location: Cabinet 3

Photo of the Demonstration at the University of Texas at Austin.

Instructions / Notes:

• A small hand cranked DC generator is coupled to a second DC generator - which then functions as motor.
• Another, more robust DC generator is connected to one or two automotive light bulbs.
• After about 3 or 4 seconds of cranking, the internal friction of the generator increases due to the resistance of the heated filament in the bulb or bulbs.

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Demo Staff:

• One of the two, blue Genecon generators needs to be taped to the table top to prevent it from flopping around.

Last updated on June 22, 2026