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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
amplify electrical signals
B
turn the flow of electricity on and off
C
create a magnetic field
D
allow current to flow only in one direction
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
atoms
B
electrons
C
neutrons
D
protons
3) Electric circuits provide energy for lightbulbs. Which of these prevents the flow of electrons?
A
a circuit that is closed
B
a series circuit
C
a circuit that is open
D
a parallel circuit
4) Energy is transferred in an electrical circuit through
A
static electrons
B
moving electrons
C
moving protons
D
static protons
5) Which of these will always produce a magnetic field?
A
a bar of aluminum
B
an electric charge
C
an electric current
D
a bar of steel
6) Which set of conditions will produce an electric current in a closed loop of wire?
A
a magnet at rest inside the loop of wire
B
a magnet touching the loop of wire
C
a magnet passing through 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
held very tightly by each atom.
B
free to move between many atoms.
C
shared between two atoms.
D
transferred between atoms forming ions.
8) What distinguishes a conductor from an insulator?
A
the ease of flow of electrons through the material
B
the rate that neutrons travel through the material
C
the amount of electrons present
D
the amount of neutrons present
9) A material with a very high electrical resistance is most likely a
A
nonmetallic electrical insulator.
B
metallic electrical conductor.
C
metallic electrical insulator.
D
nonmetallic electrical conductor
10) What happens when electrons move from one object to another by direct contact?
A
friction
B
conduction
C
detection
D
induction
*select an answer for all questions
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