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Regenerative brakes are used in some ( electric, petroleum, diesel, biofuel, autonomous ) or hybrid cars. They use the system that drives the vehicle to do the majority of the braking. Rather than converting ( kinetic, electrical, heat, sound, gravitational potential ) energy into ( heat, kinetic, sound, gravitational potential, electrical ) energy, they ( put the vehicle's motor into reverse, stop the vehicle's motor instantly, reduce friction between the tyres, recharge the motor during the braking ). With the motor running backwards, the wheels are ( slowed, sped up, stopped, not damaged ).
This also allows the motor to act as ( an electric generator, a battery, a motor, a power supply ), converting ( kinetic, heat, sound, electrical, chemical ) energy into ( electrical, heat, sound, kinetic, chemical ) energy, which is subsequently converted into ( chemical, electrical, kinetic, heat, sound ) energy and stored in the vehicle's ( battery, motor, brakes, power supply ). This makes regenerative brakes far more efficient.