An electric motor could be used as a: ___________?
Correct answer: C. Dynamo
- A. Battery
- B. Capacitor
- C. Dynamo
- D. Transformer
Explanation
An electric motor and a dynamo are reversible electromagnetic machines: a motor converts electrical energy into mechanical energy, while a dynamo converts mechanical energy into electrical energy. The likely trap is transformer, which changes AC voltage but does not normally convert electrical energy into mechanical rotation.
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About Faraday's Law
Faraday's law states that an induced electromotive force equals the rate of change of magnetic flux linkage through a circuit. Questions cover changing field, area, angle or motion, the negative sign associated with Lenz's law, and the distinction between induced emf and the current that may flow in a closed circuit.
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