AnswersTX-Physics BApplications of Electromagnetic Induction

Applications of Electromagnetic Induction Answers

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Elena makes a table to organize the functions of electric motor components.Which functions belong in the cells marked X and Y?

Question illustration
A
X: Conducts current to the armature and reverses direction of currentY: Rotates as a result of changing magnetic forces
B
X: Rotates as a result of changing magnetic forcesY: Conducts current to the armature and reverses direction of current
C
X: Allows current to flow into the commutatorY: Conducts current to the armature and reverses direction of current
D
X: Allows current to flow into the commutatorY: Rotates as a result of changing magnetic forces
2
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The voltage across the primary winding is 350,000 V, and the voltage across the secondary winding is 17,500 V. If the secondary winding has 600 coils, how many coils are in the primary winding?

A
30 coils
B
583 coils
C
12,000 coils
D
332,500 coils
3

Which is an important step in how an electric motor uses magnetic force to produce motion?

A
As the north pole of the electromagnet nears the north pole of the permanent magnet, the current reverses and the poles of the magnets then attract.
B
As the north pole of the electromagnet nears the south pole of the permanent magnet, the current reverses and the poles of the magnets then repel.
C
As the north pole of the electromagnet nears the north pole of the permanent magnet, the current reverses and the poles of the magnets then repel.
D
As the north pole of the electromagnet nears the south pole of the permanent magnet, the current reverses and the poles of the magnets then attract.
4

The voltage across the secondary winding is 10,000 V, and the voltage across the primary winding is 25,000 V. If the primary winding has 200 coils, how many coils are in the secondary winding?

A
50 coils
B
80 coils
C
125 coils
D
500 coils
6

Which component is found only in electric generators and not in electric motors?

A
a commutator
B
brushes
C
an armature
D
slip rings
7

Keiko builds a transformer in the lab, but it does not decrease the voltage as much as she needs. What should Keiko change to further reduce the voltage?

A
She should make the number of coils in the primary winding less than in the secondary winding.
B
She should make the number of coils in the primary winding the same as in the secondary winding.
C
She should increase the number of coils in the secondary winding.
D
She should increase the number of coils in the primary winding.
8

How does an electric generator work?

A
The axle rotates the armature in the magnetic field of a permanent magnet, which induces an electric current.
B
The armature rotates the axle in the magnetic field of a permanent magnet, which induces an electric current.
C
The axle rotates the armature in the magnetic field of an electromagnet, which induces an electric current.
D
The armature rotates the axle in the magnetic field of an electromagnet, which induces an electric current.
9

The voltage across the primary winding is 6000 V. If the primary winding has 50 coils and the secondary winding has 20 coils, what is the secondary voltage?

A
120 V
B
2400 V
C
15,000 V
D
120,000 V
10

Which best describes the steps involved in the operation of an electric generator?

A
The electric current passes from the power source, through the brushes, and into the commutator.
B
The electric current passes from the brushes, through the slip rings, and to the collection device.
C
The electric current passes from the slip rings, through the brushes, and to the collection device.
D
The electric current passes from the commutator, through the brushes, and into the power source.

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