An educational and experimental device for regenerative braking energy with motor, generator, supercapacitor, battery and fuel cell is developed to explain how to get, save and use the regenerative energy. It is possible how to calculate the conversion efficiency from the mechanical kinetic energy of flywheel to electric energy which is saved in battery and supercapacitor. The device can be used to demonstrate for the regenerative energy of various vehicles and trains. Students can know how to save the discarding energy of vehicles by brakes.
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