AnswersLHS Physical ScienceUnit Test

Electric Current Answers

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1
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Which most likely has the greatest conductivity?

A
a warm plastic rod
B
a cool rubber tube
C
a cool silver strip
D
a warm copper wire
2
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Electric current flows through paths called circuits. People often build circuits using wires, resistors, and batteries. A battery is a voltage source.

A
wires, a 9V battery, no resistors
B
wires, a 9V battery, a light bulb
C
wires, a 1.5V battery, no resistors
D
wires, a 1.5V battery, a light bulb
3

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.
4

Electric current is the flow of charged particles called ________

A
protons.
B
electrons.
C
sparks.
D
static.
5

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
6

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.
7

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
8

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
9

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.
10

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

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Electric Current Answers — LHS Physical Science