In hybrid vehicles, I know the battery can be recharged using regenerative braking, but I also see them sometimes recharge the battery using the engine directly. Why would they do this? It seems like it would be better to use the motor just to move the vehicle. Why go gas -> engine -> battery -> wheels?
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It depends on how efficient the gasoline engine is at moving the vehicle versus driving the alternator. If the alternator + electric motor is more efficient than the internal combustion engine + mechanical transmission, then it’s better to use the gasoline as an electrical energy source rather than as the prime mover for the vehicle.
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