What is the correct description of AC motors?

What is the correct description of AC motors?

• A. They run on direct current where current flows in one direction
• B. They run on alternating current where current periodically changes direction
• C. They convert AC to DC internally
• D. They require a DC source for starting

Answer: (B)

AC motors run on alternating current, meaning the current reverses direction at a regular frequency. This changing current creates a rotating magnetic field in the stator, which causes the rotor to turn and produce continuous torque without a mechanical commutator in many designs. The description that matches is that they operate with alternating current where the current periodically changes direction. The other statements describe DC motors or imply internal conversion or a mandatory DC starting source, which isn’t a general characteristic of standard AC motors.

AC motors run on alternating current, meaning the current reverses direction at a regular frequency. This changing current creates a rotating magnetic field in the stator, which causes the rotor to turn and produce continuous torque without a mechanical commutator in many designs. The description that matches is that they operate with alternating current where the current periodically changes direction. The other statements describe DC motors or imply internal conversion or a mandatory DC starting source, which isn’t a general characteristic of standard AC motors.