Lesson: Direct-Current MotorsPhysics
In this lesson, we will learn how to describe the use of a commutator in producing uniform circular motion from the output of a direct-current source.
The diagram shows a direct current motor. The direction of current through the coil of the motor is shown. Which of the following diagrams correctly shows the direction of current through the coil when it has rotated counterclockwise by ?
Which of the following diagrams showing a direct-current motor correctly labels the poles of the magnet in the motor? The coil of the motor is simultaneously shown at four different angles to the magnetic field of the motor.
When the coil of a direct current motor is aligned normally to the plane of the magnetic field of the motor, the force on the coil is zero. Which of the following most correctly states how a direct current motor can produce uniform circular motion despite there being two positions of the motor coil that occur during one complete revolution for which the force on the coil is zero?