AnswersFL-2003310-Physical Science CRUnit Test

Electric Current Answers

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1
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Which two wire properties would provide the greatest resistance to the flow of a current?

A
short, thin
B
long, thin
C
hot, thick
D
cool, thick
2
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Look at the diagram showing resistance and flow of electrons.

Question illustration
A
X: High resistanceY: Low resistanceZ: Flow of electrons
B
X: Low resistanceY: Flow of electronsZ: High resistance
C
X: Flow of electronsY: High potential energyZ: Low potential energy
D
X: Low potential energyY: High potential energyZ: Flow of electrons
3

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.
4

Which best explains why an electric toaster is considered a resistor?

A
It increases the flow of electrons.
B
It acts as a conductor.
C
It converts electric energy to another form of energy.
D
It produces an increase in voltage within the current.
5

Measurements of two electric currents are shown in the chart.

Question illustration
A
Current X has a greater potential difference, and the charges flow at a slower rate.
B
Current Y has a greater potential difference, and the charges flow at a slower rate.
C
Current X has a greater potential difference, and the charges flow at a faster rate.
D
Current Y has a greater potential difference, and the charges flow at a faster rate.
6

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
7

What would decrease the resistance of wires carrying an electric current?

A
shorter wires
B
higher-temperature wires
C
darker-colored wires
D
thinner wires
8

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
9

The chart shows the voltage of four electric currents.

Question illustration
A
Current W flows at a higher rate than Current Z.
B
Current Y flows at a lower rate than Current X.
C
Current X has a lower potential difference than Current Y.
D
Current Z has a greater potential difference than Current W.
10

Electric current is the flow of charged particles called ________

A
protons.
B
electrons.
C
sparks.
D
static.

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