AnswersFL-2003310-Physical Science CRLab: Newton's Laws of Motion

Applications of Electromagnetism Answers

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1
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What is the function of the slip rings in an electric generator?

A
keeping current flowing in one direction
B
stopping current from leaving the generator
C
producing a path for current to flow
D
preventing the armature from spinning
2
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The picture shows a basic diagram of an electric motor.

Question illustration
A
X: Brush Y: Armature Z: Commutator
B
X: Commutator Y: Brush Z: Armature
C
X: Armature Y: Commutator Z: Brush
D
X: Armature Y: Brush Z: Commutator
3

Which type of current flows in only one direction and is produced by a battery?

A
magnetic
B
voltage
C
alternating
D
direct
4

Which best compares AC and DC?

A
AC flows in one direction, and DC repeatedly switches direction.
B
DC flows in one direction, and AC repeatedly switches direction.
C
AC is used only in generators, and DC is used only in motors.
D
DC is used only in generators, and AC is used only in motors.
5

Laptop computers are made with batteries, but they must also be plugged into outlets to charge the batteries. Which is true regarding laptops?

A
They run only on alternating current.
B
They run only on direct current.
C
They can run on either direct or alternating current.
D
They do not run on direct or alternating current.
6

Which reverses the flow of current through an electric motor?

A
brush
B
battery
C
armature
D
commutator
7

Helen adjusts the armature of an electric generator by increasing the number of coils around the iron core. What is Helen most likely trying to do?

A
maintain the direction of the current flow
B
reverse the direction of the current flow
C
decrease the amount of current
D
increase the amount of current
8

What is the function of an electromagnet in an electric doorbell?

A
It acts as a switch to open the circuit.
B
It acts as a switch to close the circuit.
C
It repels a metal striker, which then pulls away from the bell.
D
It attracts a metal striker, which then hits the bell.
9

An electric generator converts kinetic energy into which kind of energy?

A
stored
B
mechanical
C
potential
D
electrical
10

Rob is studying for an exam. He listed some properties of magnets in a Maglev train.

Question illustration
A
The current in the electromagnet of the guidance magnet does not change.
B
The types of magnets are listed incorrectly in the table and should be switched.
C
The unlike poles of the guideway and support magnets face each other.
D
The repelling of the support magnet decreases friction.

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