Welcome to the Quiz!
This quiz contains 15 questions from a mix of 1 subtopics.
What type of particles act as charge carriers resulting in current flow in metals?
nuclei
free electrons
neutrons
protons
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Which of the following correctly describes the movement of charge carriers that results in their net drift velocity?
they move in circular orbits
they move in a zig-zag path
they move in straight lines
they move in random directions
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If the drift velocity of charge carriers is increased while all other factors are held constant, what will happen to the current?
it will increase
it will remain unchanged
it will decrease
the relationship cannot be determined from the information given
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Semiconductors require a _______ drift velocity compared to metals to achieve the same current.
lower
similar
higher
unpredictable
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Molten ionic compounds conduct electricity because they contain both _____ and _____ ions that can move and carry charge.
positive, larger
similar, oppositely charged
positive, negative
neutral, charged
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Which of the following best explains why gases do not normally conduct electricity well?
gases have no free charge carriers
gases cannot attain drift velocity
gases repel all charged particles
gases cannot be ionized
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Increasing which of the following will directly increase the electric current through a conductor?
charge per particle
cross-sectional area
all of the above
number of charge carriers per unit volume
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What happens to the conductivity of gases when they become ionized?
it decreases significantly
it starts oscillating
it remains unchanged
it increases greatly
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The drift velocity attained by charge carriers is determined by:
the temperature of the material only
the strength of the electric field only
neither the electric field strength nor temperature
both the electric field strength and temperature
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What physical quantity denotes the electric current passing through a conductor?
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What term represents the number of charge carriers present per unit volume in a material?
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Explain three factors that determine the value of electric current through a conductor.
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Give two differences in charge carriers between metals and semiconductors.
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Calculate the current flowing through a semiconductor wire with a cross-sectional area of 1.5 x 10-6 m2. The number of charge carriers per unit volume is 5 x 1022 m-3, and the mean drift velocity is 0.05 m s-1.
6 x 10-4 A
6 x 10-2 A
1.2 x 10-4 A
1.2 x 10-2 A
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Given a wire with a cross-sectional area of 4 x 10-7 m2, a number density of charge carriers of 2.5 x 1028 m-3, and a charge per particle of 1.6 x 10-19 C, calculate the current if the mean drift velocity is 0.02 m s-1.
4 A
8 A
32 A
16 A
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