The correct answer is: C. universal motor.
A universal motor is a type of electric motor that can be powered by both AC and DC electricity. It is commonly used in portable drills, vacuum cleaners, and other small appliances.
A universal motor has a stator and a rotor. The stator is the stationary part of the motor, and the rotor is the rotating part. The stator has two windings, a main winding and a starting winding. The main winding is connected to the power source, and the starting winding is connected to a capacitor.
When the motor is turned on, the current flows through the main winding and creates a magnetic field. This magnetic field interacts with the magnetic field of the rotor, which causes the rotor to rotate. The starting winding is only used to start the motor, and it is disconnected once the motor is up to speed.
Universal motors are efficient and powerful, and they are well-suited for use in portable appliances. However, they can be noisy and they produce a lot of vibration.
Here is a brief explanation of each option:
- A capacitor run motor is a type of electric motor that uses a capacitor to start the motor. The capacitor creates a magnetic field that helps to turn the motor over. Capacitor run motors are commonly used in fans, blowers, and other small appliances.
- A hysteresis motor is a type of electric motor that uses a magnetic field to create torque. Hysteresis motors are commonly used in clocks, watches, and other small appliances.
- A repulsion motor is a type of electric motor that uses the repulsion of two magnetic fields to create torque. Repulsion motors are commonly used in vacuum cleaners and other small appliances.