Select the best answer for problems 1 through 7 to make each...

Select the best answer for problems 1 through 7 to make each statement true. Place the letter of your answer in the space provided. To obtain motor action, current is supplied to a loop of wire in a magnetic field by_____ a. slip rings. b. split rings. c. a commutator. d. brushes. e. brushes and a commutator.

Select the best answer for problems 1 through 7 to make each statement true. Place the letter of your answer in the space provided.
To obtain motor action, current is supplied to a loop of wire in a magnetic field by_____
a. slip rings.
b. split rings.
c. a commutator.
d. brushes.
e. brushes and a commutator.

Key Concepts

Commutator

A commutator is a rotary switch in DC motors that periodically reverses the direction of current flow through the motor windings as the motor rotates. This reversal is essential to maintain continuous rotational force in one direction. The commutator, by switching the current at precise intervals, ensures that the torque is consistently applied in a way that sustains rotation.

Brushes

Brushes are conductive components that establish an electrical connection between the stationary part of the motor (the external power supply) and the rotating part (the commutator and coil). They transfer current to the commutator despite the rotation, allowing for continuous delivery of electrical energy to the motor windings. Together with the commutator, brushes are vital in achieving controlled commutation necessary for motor operation.

Electric Motor Principle

This concept involves the conversion of electrical energy into mechanical energy. In an electric motor, a current-carrying loop or coil is placed within a magnetic field, and the forces generated by the interaction of the current with the magnetic field produce a torque. This torque causes the loop to rotate, which is the fundamental mechanism by which an electric motor produces motion.

Magnetic Field Interaction

Magnetic fields exert forces on moving charges in conductors. When current flows through a wire loop positioned in a magnetic field, the Lorentz force acts on the moving charges, resulting in a mechanical force on each segment of the wire. The net effect of these forces, when arranged appropriately, is the rotation of the loop, demonstrating the interaction between electricity and magnetism in motor operation.

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