Question

4.3.2 test (cst): electromagnets
question 5 of 20
which sentence best describes the function of an electric motor?
a. an electric motor uses electrical energy to produce mechanical energy.
b. an electric motor uses mechanical energy to produce electrical energy.
c. an electric motor uses electrical energy to produce magnetic force.
d. an electric motor uses magnetic force to produce electrical energy.

Explanation:

An electric motor operates based on the principle of converting electrical energy into mechanical energy. When an electric current passes through the motor's coil placed in a magnetic field, a force is exerted on the coil, causing it to rotate. This rotational motion is mechanical energy.

• Option B is incorrect because it describes the function of a generator (mechanical to electrical energy conversion).
• Option C is incorrect as producing magnetic force is part of the motor's operation mechanism but not its overall function (which is energy conversion).
• Option D is incorrect as it has the energy conversion direction reversed.

Answer:

A. An electric motor uses electrical energy to produce mechanical energy.