Variable-speed control for small motors is accomplished by controlling the amount of ____ applied to the motor or by inserting impedance in series with the stator winding.
A) current
B) pressure
C) voltage
D) amperage

Question

Quizplus · Accepted Answer

Variable-speed control for small motors is accomplished by controlling the amount of voltage applied to the motor. This is typically done through the use of a phase-controlled rectifier or by adjusting the supply voltage using a microcontroller or other electronic circuitry. Inserting impedance in series with the stator winding is also a method of controlling motor speed, but it is less commonly used for small motors.

Variable-Speed Control for Small Motors Is Accomplished by Controlling the Amount