Question
For a current-carrying wire, the current can be calculated using the equation shown.
I = Anvq
What is the meaning of n?
A the number of charge carriers in the wire
B the number of charge carriers multiplied by the volume of the wire
C the number of charge carriers per unit length of the wire
D the number of charge carriers per unit volume of the wire
Answer/Explanation
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Question
The number of free electrons passing a point in a wire in 24 hours is \(6.0\times 10^{23}\).
What is the average current in the wire?
A \(6.3\) pA B \(1.1\)A C \(67\)A D \(4.0\) kA
Answer/Explanation
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Question
What is meant by electric field strength?
A force per unit charge acting on a small mass
B force per unit charge acting on a small positive charge
C force per unit mass acting on a small mass
D force per unit mass acting on a small positive charge
Answer/Explanation
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Question
The current I in a wire is given by the equation
I = nAvq
where n is the number density of the free electrons, A is the cross-sectional area of the wire, v is the average drift velocity of the free electrons and q is the charge of an electron. Which relationship is not used in the derivation of this equation?
A charge = current × time
B distance = speed × time
C number = number density × area
D volume = length × area
Answer/Explanation
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Question
Which two units are used to define the coulomb?
A ampere and second
B ampere and volt
C volt and ohm
D volt and second
Answer/Explanation
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