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A DC motor will generate electricity, if used in reverse. IE, rotate it and electricity will be generated.

The voltage will be dependant on the speed of rotation. The capacity (Amperage) will depend on the size of the windings and diameter of copper wire involved.

Limitation to power and speed will also be limited by the construction of the commutator.

All these variables are difficult to predict and unlikely a formula is available.

You will need empirical means and careful testing, especially as the motor was not intended to be used in this way.

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Q: How do you calculate how much electricity a DC motor will generate?
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