If an emf is produced in a dc motor, would it be possible to use the motor somehow as a generator or source, taking power out of it rather than putting power into it? How might this be done?
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$\begingroup$ Duplicate? $\endgroup$ – Farcher Dec 10 '18 at 9:11
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$\begingroup$ bicycle lights come to mind., en.wikipedia.org/wiki/Dynamo $\endgroup$ – anna v Dec 10 '18 at 16:39
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Yes an electric motor will also work as a generator. That is, you can connect it to a load and when you rotate the motor it will push a current though the load. There is a thorough explanation of this in Farcher's answer to Eddy current induce emf.
However designing a generator for maximum efficiency is a complicated business, and your motor will not be as efficient a generator as a generator that has been specifically designed for the purpose. The differences between motors and generators are explored in How does the electric motor and generator vary?
answered Dec 10 '18 at 10:12
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