Pre-Lecture Quiz #4 – Flashcards
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Which of the following would double the amount of current flowing through a piece of metal wire?
1. Halve the voltage across it.
2. Quarter the voltage across it.
3. Double the voltage across it.
4. Quadruple the voltage across it.
answer
3. Double the voltage across it
question
If the resistivity of copper is less than that of gold at room temperature, which of the following statements must be true?
1. The sample of gold is thinner than the sample of copper.
2. Gold has a higher resistance than copper.
3. There is more current flowing in the gold than in the copper.
4. Electrons in gold are more likely to be scattered than electrons in copper at room temperature when they are accelerated by the same electric field.
answer
4. Electrons in gold are more likely to be scattered than electrons in copper at room temperature when they are accelerated by the same electric field.
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How do the resistances of two conducting wires compare if they have the same length, but one is twice the radius of the other?
1. The resistance is the same in both wires.
2. The thicker wire has twice the resistance of the thinner wire.
3. The thicker wire has one-fourth the resistance of the thinner wire.
4. The thicker wire has half the resistance of the thinner wire.
answer
3. The thicker wire has one-fourth the resistance of the thinner wire.
question
Consider two copper wires with the same cross-sectional area. Wire A is twice as long as wire B. How do the resistivities and resistances of the two wires compare?
1. Wire B has twice the resistivity of wire A.
2. Wire A has twice the resistance of wire B.
3. Wire A has twice the resistivity of wire B.
4. Wire A and wire B have the same resistivity.
5. Wire B has twice the resistance of wire A.
6. Wire A and wire B have the same resistance.
answer
2. Wire A has twice the resistance of wire B.
4. Wire A and wire B have the same resistivity.
question
If the resistance in a circuit connected to a constant current is halved, how is the voltage in the circuit affected?
1. The voltage remains constant.
2. The voltage is reduced by a factor of 4.
3. The voltage is quadrupled.
4. The voltage is reduced by a factor of 2.
5. The voltage is doubled.
answer
4. The voltage is reduced by a factor of 2.
question
A constant voltage is applied across a circuit. If the resistance in the circuit is doubled, what is the effect on the power dissipated by the circuit?
1. The power dissipated is doubled.
2. The power dissipated remains constant.
3. The power dissipated is quadrupled.
4. The power dissipated is reduced by a factor of 2.
5. The power dissipated is reduced by a factor of 4.
answer
4. The power dissipated is reduced by a factor of 2.
