Which component helps in making contact with the slip rings in a Wound Rotor Motor?

In a Wound Rotor Motor, brushes are key components that facilitate electrical contact with the slip rings. The slip rings are attached to the rotor and allow for the transmission of current to the windings in the rotor. As the rotor spins, the brushes maintain contact with the slip rings, ensuring a continuous flow of electricity to energize the rotor's windings. This setup is crucial for controlling the motor’s torque and speed characteristics.

Brushes are typically made of carbon or graphite, chosen for their conductive properties and ability to withstand wear. They provide a critical interface in the operation of wound rotor motors, enabling efficient energy transfer and the generation of the motor's magnetic field, which is central to its operation.

The other options serve different functions: diodes and transistors are components used in controlling and rectifying electrical circuits, while coils are used to create magnetic fields within the motor but do not establish contact with the slip rings. Thus, brushes are the appropriate choice for making contact with the slip rings in a Wound Rotor Motor.