In items 11 through 30, select the best answer to make each...

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided. Brushes are required on a DC motor to____ a. provide a sliding contact. b. change the direction of current in the armature. c. support the commutator. d. change the direction of the current in the external circuit.

In items 11 through 30, select the best answer to make each statement true. Place the letter of your answer in the space provided.
Brushes are required on a DC motor to____
a. provide a sliding contact.
b. change the direction of current in the armature.
c. support the commutator.
d. change the direction of the current in the external circuit.

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Key Concepts

Armature

The armature is the rotating part of a DC motor that carries the windings where electromotive forces are induced. It interacts with the fixed magnetic field of the stator to produce torque, and its current is periodically reversed by the commutation system for continuous operation.

DC Motor

A DC motor is an electric motor that converts direct current electrical energy into mechanical energy through the interaction of magnetic fields and current-carrying conductors, typically designed to provide controlled movement and speed regulation in various applications.

Commutation

Commutation refers to the process of reversing the direction of current flow through the motor's armature windings. This mechanism ensures continuous rotation by switching the current at the appropriate times, typically achieved with the help of a commutator and brushes.

Brushes

Brushes are conductive components that maintain electrical contact with the commutator on a DC motor. They facilitate the transfer of current between stationary external circuits and the rotating armature, playing a critical role in the commutation process.

Transcript

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