Why can electricity be generated by the spinning wheels of a car when it is driving normally?
The Alternators in your car produces electricity to recharge your batteries even when the car is idling. Hybrids, however, use magnetic brakes to transform energy that would have been lost to friction back into electrical power. There would be no point in doing this while driving because you are just burning fossil to produce electricity. Meaning, you are using your car as a generator and not a car.