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Connect a motor with electricity source ,attach a wheel to it , switch off the motor,convert rotating wheel energy to electricity possible?

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That's how a Prius' braking system works! When you apply the brakes the electric motor that runs the wheels becomes a generator and pumps electricity back into the batteries; this slows down the car as motion is converted to electricity. Because of friction losses and motor inefficiency, you can only get less than 10% of the energy out that you put in, however.

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It is possible to convert rotating wheel energy to electricity by connecting a motor with electricity source. This is made possible by transferring the movement of the auto-rotating wheel to the power plant. An electromotor is used to make it successful.

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Yes it is possible, but there is always a net loss of energy involved when changing electricity to motion, and or motion into electricity. Electric motors are not 100% efficient due to friction and heat, so there is a loss when making a motor spin a wheel. To then take that spinning wheel and use it to generate power is possible, but it is not 100% percent efficient. There is a loss there too. You cannot obtain back all of the power you originally put into it. If you put this set up into the braking system of an electric car, especially in city traffic, that would be nice, but in general there is not enough benefit to doing this with other things, especially with things that have been running for a long time.

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It's already in use in the Prius and other hybrid cars.
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