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
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?