AnswersFall 24 GSE Physical Science B ICElectric Charge

Applications of Electromagnetism Answers

2 verified answers
1
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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.
2
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Which best contrasts electric doorbells and audio speakers?

A
Doorbells involve rapid changes in the direction of current, and speakers do not.
B
Speakers involve rapid changes in the direction of current, and doorbells do not.
C
Doorbells require closed circuits in order to work, and speakers do not.
D
Speakers require closed circuits in order to work, and doorbells do not.
3

An electric motor converts electrical energy into which kind of energy?

A
potential
B
kinetic
C
stored
D
chemical
4

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
5

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
6

Which uses direct current?

A
A toaster oven.
Option A
B
A flashlight.
Option B
C
A microwave oven.
Option C
D
A vacuum cleaner.
Option D
7

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

A
magnetic
B
voltage
C
alternating
D
direct
8

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.
9

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

A
stored
B
mechanical
C
potential
D
electrical
10

Which reverses the flow of current through an electric motor?

A
brush
B
battery
C
armature
D
commutator

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