Electric Current Answers

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Why is copper used for most electrical wiring?

A
It has high voltage.
B
It has low voltage.
C
It is a good conductor.
D
It is a good insulator.
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

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
4

Anton created a chart listing different types of materials.

Question illustration
A
X: copperY: glass
B
X: rubberY: copper
C
X: paperY: silicon
D
X: siliconY: glass
5

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.
6

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
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
9

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
10

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.

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