What is the difference between an AC motor and a DC motor.

a. An AC motor uses DC current, while a DC motor uses AC current.
b. An AC motor is more efficient than a DC motor.
c. An AC motor changes direction periodically, while a DC motor only spins in one direction.
d. An AC motor only spins in one direction, while a DC motor changes direction periodically.
Answer: c. An AC motor changes direction periodically, while a DC motor only spins in one direction.