Unit Test — Unit test Answers
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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 balancedB
decrease the wire’s resistanceC
increase the voltage produced by the wireD
keep a current from passing out of the wire22
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Tisa makes a diagram to organize her notes about charging objects.
A
Electrons move between objects.B
The objects do not touch.C
The objects develop opposite charges.D
The objects have the same charge.23
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.24
How are the current and resistance related when the voltage of a circuit is constant?
A
The current doubles when the resistance doubles because they are directly proportional.B
The current doubles when the resistance doubles because they are inversely proportional.C
The current is cut in half when the resistance doubles because they are directly proportional.D
The current is cut in half when the resistance doubles because they are inversely proportional.25
Georgia moves an unattached piece of wire back and forth over a magnet. Which best explains what will happen?
A
A current will be induced because the wire moves through a magnetic field.B
A current will not be induced because the wire moves through a magnetic field.C
A current will be induced because the wire is not part of a closed circuit.D
A current will not be induced because the wire is not part of a closed circuit.26
Beth made the chart shown.
A
X: Use DC Y: Use ACB
X: Use AC Y: Use DCC
X: Powered by Current Y: Powered by MagnetismD
X: Powered by Magnetism Y: Powered by Current27
The diagram shows a coiled wire that carries an electrical current.
A
the magnetic fieldB
thermal energyC
light energyD
the electric field28
What is the resistance of a clock if it has a current of 0.30 A and runs on a 9.0-V battery?
A
0.033
B
2.7C
9.3D
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