Discussion
A dc motor converts
Answer: A
Correct answer: electrical energy into mechanical energy
A motor converts electrical input into mechanical output at the shaft, less the losses. The same machine run as a generator does the reverse, and a dc machine will do either depending on whether it is supplied or driven - which is what makes regenerative braking possible. The commutator does convert alternating conductor currents to a unidirectional terminal current, but that is a detail of its construction rather than a description of what the machine is for.
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