SAT Subject Physics Practice Question 603: Answer and Explanation

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Question: 603

14. Electrical energy is changed into mechanical energy in a device called a/an

A. electromagnet.
B. generator.
C. magnetron.
D. motor.
E. transformer.

Correct Answer: D

Explanation:

The correct answer is (D). An electric current is passed through an electromagnet or rotor, which causes it to spin within an applied magnetic field. The spinning rotor is the source of mechanical energy that is derived from electrical energy.

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