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Electricity Review
Test Description: Questions selected from the Unit 6 test.
Instructions: Answer all questions to get your test result.
1) A diode is a semiconductor that is used to--
A
create a magnetic field
B
amplify electrical signals
C
allow current to flow only in one direction
D
turn the flow of electricity on and off
2) If a wool sock is dragged across a rug, there is a buildup of static electricity on the wool sock. Which type of particle is transferred between the rug and the sock to cause this static?
A
protons
B
neutrons
C
atoms
D
electrons
3) Electric circuits provide energy for lightbulbs. Which of these prevents the flow of electrons?
A
a circuit that is closed
B
a circuit that is open
C
a series circuit
D
a parallel circuit
4) Energy is transferred in an electrical circuit through
A
moving electrons
B
static electrons
C
static protons
D
moving protons
5) Which of these will always produce a magnetic field?
A
a bar of aluminum
B
a bar of steel
C
an electric current
D
an electric charge
6) Which set of conditions will produce an electric current in a closed loop of wire?
A
a magnet passing through the loop of wire
B
a magnet at rest inside the loop of wire
C
a magnet touching the loop of wire
D
a magnet at rest outside the loop of wire
7) Copper is used in electrical wiring because electrons are
A
free to move between many atoms.
B
transferred between atoms forming ions.
C
shared between two atoms.
D
held very tightly by each atom.
8) What distinguishes a conductor from an insulator?
A
the amount of electrons present
B
the ease of flow of electrons through the material
C
the amount of neutrons present
D
the rate that neutrons travel through the material
9) A material with a very high electrical resistance is most likely a
A
metallic electrical conductor.
B
nonmetallic electrical conductor
C
metallic electrical insulator.
D
nonmetallic electrical insulator.
10) What happens when electrons move from one object to another by direct contact?
A
friction
B
conduction
C
induction
D
detection
*select an answer for all questions
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