AnswersELPGEQ2 MJ Science 3 - 2002100 HCPS v24Electric Charge

Electric Charge — Test Answers

24 verified answers
1
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What is required for an electric charge to flow through a wire?

A
zero resistance in the wire
B
a balance of electric potential
C
high resistance in the wire
D
a difference in electric potential
2
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Cora, an electrician, wraps a copper wire with a thick plastic coating. What is she most likely trying to do?

A
keep the electric potential of the wire balanced
B
decrease the wire’s resistance
C
increase the voltage produced by the wire
D
keep a current from passing out of the wire
3

Tisa makes a diagram to organize her notes about charging objects.

Question illustration
A
Electrons move between objects.
B
The objects do not touch.
C
The objects develop opposite charges.
D
The objects have the same charge.
4

In a movie, a character cuts a wire, which stops the countdown timer of a bomb. What does cutting the wire do to the circuit?

A
It opens the circuit so that electric charges do not flow to the timer.
B
It closes the circuit so that electric charges do not flow to the timer.
C
It opens the circuit so that electric charges flow to the timer.
D
It closes the circuit so that electric charges flow to the timer.
5

The image shows the electric field lines around two charged particles.

Question illustration
A
1
B
2
C
3
D
4
6

Which device manages the flow of current in an electric circuit?

A
the wire
B
the switch
C
the battery
D
the light bulb
7

Which will a positively charged object attract?

A
an object that has a negative charge
B
an object that has a smaller positive charge
C
an object that has no charge
D
an object that has a larger positive charge
8

Mateo makes a table of the symbols that represent the parts of an electric circuit.

Question illustration
A
Uses electrical energy
B
Provides electrical energy
C
Measures electric current
D
Controls electric current
9

How does increasing the distance between charged objects affect the electric force between them?

A
The electric force increases because the distance has an indirect relationship to the force.
B
The electric force increases because the distance has a direct relationship to the force.
C
The electric force decreases because the distance has an indirect relationship to the force.
D
The electric force decreases because the distance has a direct relationship to the force.
10

Nina is working with electricity and shortens the wires through which the current is flowing. What is Nina most likely trying to accomplish?

A
convert electric energy to heat
B
convert electric energy to light
C
increase resistance
D
decrease resistance
11

What is an advantage of series circuits?

A
Adding more batteries will increase the current.
B
There is more than one path for charges to flow.
C
If one bulb goes out, the other bulbs still shine.
D
Light bulbs get dimmer as more bulbs are added.
12

Potential difference is measured in which units?

A
volts
B
amps
C
currents
D
watts
13

Jodi made a list about electric current to help her study for a test.1) Movement of electrons is continuous in a current.2) Electrons move from areas of low to high electric potential.3) Voltage causes current to flow.4) Rate at which current flows is measured in amperes.

A
The movement of electrons is not always continuous.
B
Electrons move from areas of high to low electric potential.
C
Resistance causes current to flow.
D
The rate at which current flows is measured in ohms.
14

Which lists types of materials from most conductive to least conductive?

A
insulator, semiconductor, conductor, superconductor
B
superconductor, conductor, semiconductor, insulator
C
conductor, insulator, semiconductor, superconductor
D
semiconductor, conductor, superconductor, insulator
15

What symbol would best represent an electric fan speed controller in an electric circuit?

A
Option
B
Option
C
Option
D
Option
16

Shareen performs a skit to model a method of charging. In the skit, a painter shakes her hand and gets paint on her.

A
It models induction because the painter represents a neutral object and the paint represents electrons that are transferred through rubbing.
B
It models conduction because the painter represents a charged object and the paint represents electrons that are transferred through contact.
C
It models induction because the painter represents a charged object and the paint represents electrons that are transferred through contact.
D
It models conduction because the painter represents a neutral object and the paint represents electrons that are transferred through rubbing.
17

How does a parallel circuit change when a branch is added?

A
The total resistance increases, so the current in the circuit decreases.
B
The total resistance decreases, so the current in the circuit increases.
C
The total resistance increases, so bulbs shine at a lower brightness.
D
The total resistance decreases, so bulbs shine at a higher brightness.
18

In the diagram, the arrow shows the movement of electric charges through a wire connected to a battery.

Question illustration
A
a balance in electric potential
B
a balance in resistance
C
a difference in electric potential
D
a difference in resistance
19

Resistance depends on which three properties of a wire?Color and texture are not directly related to a wire’s resistance.

A
color, thickness, texture
B
thickness, length, temperature
C
length, texture, temperature
D
temperature, color, texture
20

What would make oppositely charged objects attract each other more?

A
increasing the positive charge of the positively charged object and increasing the negative charge of the negatively charged object
B
decreasing the positive charge of the positively charged object and decreasing the negative charge of the negatively charged object
C
increasing the distance between the positively charged object and the negatively charged object
D
maintaining the distance between the positively charged object and the negatively charged object

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