Capacitors are primarily used with which type of motors?

Capacitors are primarily used with single-phase motors to improve their starting torque and efficiency. In single-phase induction motors, capacitors provide an initial phase shift that helps generate a rotating magnetic field, which is essential for starting the motor. The capacitor increases the phase difference between the windings, allowing the motor to start and run more effectively.

While three-phase motors do not typically require capacitors for starting, they can utilize capacitors in certain applications, such as in capacitor-start motors, but this is less common than in single-phase designs. On the other hand, DC motors do not utilize capacitors in the same manner because their operation involves direct current flow, which does not require phase shifting. Thus, the use of capacitors is primarily associated with single-phase motors, making this the most accurate choice among the options provided.