What is a primary component of a single-phase AC motor?

A primary component of a single-phase AC motor consists of the start winding and run winding. In a single-phase AC motor, the start winding is used to create an initial rotating magnetic field necessary for starting the motor, while the run winding takes over once the motor has started, allowing it to operate efficiently. Together, these windings work to facilitate the operation of the motor, with the start winding typically having a higher resistance and being activated during startup.

The other options focus on components not primarily associated with single-phase AC motors. The stator and rotor are fundamental parts of various motor types, but they do not specifically categorize the unique operational aspects of single-phase AC motors. Brushes and commutators are components found in DC motors, serving the function of transferring current and allowing the motor to run, which do not apply to single-phase AC motors. Lastly, field coils and armatures relate more closely to synchronous or DC motors, where a different operational principle is in play.