Chapter 13, GENERATION OF ELECTROMOTIVE FORCE Video Solutions, Electricity 1: Devices, Circuits and Materials

Problem 1

In problems 1 through 7, select the best answer to make the statement true, and place the letter of the answer in the space provided.
The direction of induced voltage in a conductor can be changed by _____
a. increasing the field strength.
d. decreasing conductor size.
b. reversing the field direction.
e. reversing meter connections.
c. increasing conductor length.

Vishal Gupta

Numerade Educator

Problem 2

In problems 1 through 7, select the best answer to make the statement true, and place the letter of the answer in the space provided.
Direct current can be supplied to a load by a loop of wire rotating through a field with the use of_____
a. slip rings.
d. commutator.
b. electromagnets.
e. conductor.
c. brushes.

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Problem 3

In problems 1 through 7, select the best answer to make the statement true, and place the letter of the answer in the space provided.
Induced voltage can be increased in magnitude by_____
a. increasing the number of lines cut per second.
b. using a commutator.
c. using slip rings.
d. decreasing conductor length.
e. properly applying the left-hand generator rule.

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Problem 4

In problems 1 through 7, select the best answer to make the statement true, and place the letter of the answer in the space provided.
The induced voltage in a single loop reverses_____
a. once each revolution.
b. once each half-revolution.
c. twice each half-revolution.
d. twice each revolution.
e. three times each revolution.

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10:19

Problem 5

In problems 1 through 7, select the best answer to make the statement true, and place the letter of the answer in the space provided.
Maximum voltage is induced in a single loop when the sides of the loop are passing_____
a. perpendicular to the lines of force.
b. parallel to the lines of force.
c. not quite perpendicular to the lines of force.
d. at a slow rate of speed.
e. in front of the $\mathrm{N}$ pole face.

Susan Hallstrom

Numerade Educator

Problem 6

In problems 1 through 7, select the best answer to make the statement true, and place the letter of the answer in the space provided.
When a commutator is used on a single loop, the voltage at the brushes has a_____
a. very large magnitude.
b. changing polarity.
c. constant polarity.
d. zero value.
e. constant value.

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Problem 7

In problems 1 through 7, select the best answer to make the statement true, and place the letter of the answer in the space provided.
The left-hand generator rule is typically used to determine_____
a. conductor speed.
b. rotational direction.
c. field direction.
d. current direction.
e. magnetic field strength.

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17:07

Problem 8

In Figure 13-10, no voltage or current exists in any part of the circuit. Why?
_____________________________________________________________________________

Vishal Gupta

Numerade Educator

Problem 9

The speed of the armature is one factor that determines the voltage output of a generator. Name three others.
_____________________________________________________________________________

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01:02

Problem 10

When a wire is moved through a magnetic field, what is established in the wire?
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