NCTI Service Technician Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The slip ring is a critical component in an AC generator that enables continuous flow of current in the circuit. It provides a means for maintaining electrical contact with the rotating coil of the generator. As the coils of the generator rotate within a magnetic field, they produce alternating current (AC), and the slip ring allows this generated AC to be transmitted to the external circuit without interruption. The design of the slip ring permits uninterrupted electrical contact, which is essential for sustaining the flow of alternating current.

In contrast, the commutator is used in DC generators to convert the alternating current produced in the windings into direct current. It does so by reversing the connection of the winding to the external circuit at the appropriate time during the rotation. Resistors are passive components that limit or regulate the flow of electric current within the circuit but do not facilitate the generation of current. A capacitor, on the other hand, stores electrical energy temporarily and releases it when needed but does not directly contribute to the flow of current in the way that a slip ring does in an AC generator.