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
protons
neutrons
free electrons
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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 random directions
they move in circular orbits
they move in a zig-zag path
they move in straight lines
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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 remain unchanged
it will increase
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
unpredictable
higher
similar
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Molten ionic compounds conduct electricity because they contain both _____ and _____ ions that can move and carry charge.
neutral, charged
positive, negative
positive, larger
similar, oppositely charged
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Which of the following best explains why gases do not normally conduct electricity well?
gases cannot be ionized
gases cannot attain drift velocity
gases repel all charged particles
gases have no free charge carriers
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Increasing which of the following will directly increase the electric current through a conductor?
charge per particle
number of charge carriers per unit volume
cross-sectional area
all of the above
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What happens to the conductivity of gases when they become ionized?
it remains unchanged
it decreases significantly
it increases greatly
it starts oscillating
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The drift velocity attained by charge carriers is determined by:
neither the electric field strength nor temperature
both the electric field strength and temperature
the strength of the electric field only
the temperature of the material only
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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.
1.2 x 10-4 A
1.2 x 10-2 A
6 x 10-2 A
6 x 10-4 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
32 A
8 A
16 A
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