I just read an interesting overview of regenerative braking in electric cars. When you step on the throttle, torque is applied to driving the motor and this consumes battery power, but when the car is rolling and you step off the throttle, reverse torque is applied to the engine and it immediately becomes a generator, not a consumer, of electrical power.
I was always curious how this worked, and if you are too, and want more details, read the article.
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