AnswersTX-Physics CRLab: Circuit Design

Applications of Electromagnetic Induction Answers

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1
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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 diagram shows an electric motor.

Question illustration
A
W
B
X
C
Y
D
Z
3

How does an electric motor use magnetic force to produce motion?

A
The north pole of a permanent magnet placed in the center of an electromagnet attracts the north pole of the electromagnet.
B
The north pole of an electromagnet placed in the center of a permanent magnet attracts the north pole of the permanent magnet.
C
The north pole of a permanent magnet placed in the center of an electromagnet repels the north pole of the electromagnet.
D
The north pole of an electromagnet placed in the center of a permanent magnet repels the north pole of the permanent magnet.
4

Roberto plans to use two transformers to reduce a voltage of 120 V to 4 V. He uses a transformer that has 300 coils in the primary winding and 50 coils in the secondary winding. He has four other transformers, as listed in the table.Which transformer should Roberto use to have an ending voltage of 4 V?

Question illustration
A
W
B
X
C
Y
D
Z
6

What parts are found in an electric generator? Select 4 options.

A
an armature
B
a battery
C
a permanent magnet
D
an electromagnet
E
brushes
F
slip rings
7

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

A
a commutator
B
brushes
C
an armature
D
slip rings
8

Which best describes what happens in an electric generator?

A
Motion causes constantly changing magnetic fields to induce electrical energy.
B
Motion causes constantly changing magnetic fields to induce kinetic energy.
C
Constantly changing magnetic fields lead to motion, which induces electrical energy.
D
Constantly changing magnetic fields lead to motion, which induces kinetic energy.
9

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
10

In a step-down transformer, which describes the primary winding compared with the secondary winding?

A
higher voltage and fewer coils of wire
B
higher voltage and more coils of wire
C
lower voltage and fewer coils of wire
D
lower voltage and more coils of wire

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