Question

1. speed control circuits control the speed of an ac or dc motor by controlling the _________ delivered to the motor.

• a. power
• b. load
• c. reluctance
• d. cemf

Explanation:

Speed control circuits in motors work by regulating the power supplied. Power directly influences the motor's speed. Load affects torque, reluctance is related to magnetic circuits (not speed control here), and CEMF (counter - electromotive force) is a result of motor operation but not the main factor controlled for speed in this context.

Answer:

A. Power