Exercises: Motors, Generators, and Transformers

Work through each section in order. Show your work where indicated.

Grade 11·21 problems·~30 min·OpenStax Physics (High School)·section·sec-20-3

Work through problems with immediate feedback

Fluency Practice

In a DC motor, a commutator reverses the current direction every half turn. Why is this necessary?

To increase the current through the coil and produce more torque.

To prevent the coil from overheating by alternating the current direction.

To ensure the torque always acts in the same rotational direction, maintaining continuous rotation.

To convert AC from the power supply to DC for the coil.