Physics 100B - General Physics II » Spring 2022 » Pre-Class 6

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Question #1
If the resistance in a circuit connected to a constant current is halved, how is the voltage in the circuit affected?
A.   The voltage is doubled.
B.   The voltage remains constant.
C.   The voltage is reduced by a factor of 4.
D.   The voltage is quadrupled.
E.   The voltage is reduced by a factor of 2.
Question #2
What happens to the current supplied by the battery when you add an identical bulb in parallel to the original bulb?
A.   The current becomes zero.
B.   The current is cut in half.
C.   The current stays the same.
D.   The current doubles.
Question #3
In a series circuit with two identical bulbs, what happens to the remaining bulb when one is replaced with a wire?
A.   The remaining bulb gets brighter.
B.   The remaining bulb gets dimmer.
C.   The remaining bulb maintains the same brightness.
D.   The remaining bulb goes out.
Question #4
Consider three resistors with unequal resistances connected in series to a battery. Which of the following statements are true?
A.   The equivalent resistance of the combination of resistors is less than the resistance of any one of the three resistors. The algebraic sum of the currents flowing through each of the three resistors is equal to the current supplied by the battery. The voltage across each of the resistors is the same and is equal in magnitude to the voltage of the battery.
B.   The equivalent resistance of the combination of resistors is greater than the resistance of any one of the three resistors. The algebraic sum of the currents flowing through each of the three resistors is equal to the current supplied by the battery. The voltage across each of the resistors is the same and is equal in magnitude to the voltage of the battery.
C.   The algebraic sum of the voltages across the three resistors is equal to the voltage supplied by the battery. The equivalent resistance of the combination of resistors is greater than the resistance of any one of the three resistors. The current flowing through each of the resistors is the same and is equal to the current supplied by the battery.
D.   The current flowing through each of the resistors is the same and is equal to the current supplied by the battery. The algebraic sum of the currents flowing through each of the three resistors is equal to the current supplied by the battery. The voltage across each of the resistors is the same and is equal in magnitude to the voltage of the battery.
Question #5
Consider three resistors with unequal resistances connected in parallel to a battery. Which of the following statements are true?
A.   The current flowing through each of the resistors is the same and is equal to the current supplied by the battery. The algebraic sum of the voltages across the three resistors is equal to the voltage supplied by the battery. The equivalent resistance of the combination of resistors is greater than the resistance of any one of the three resistors.
B.   The current flowing through each of the resistors is the same and is equal to the current supplied by the battery. The algebraic sum of the voltages across the three resistors is equal to the voltage supplied by the battery. The equivalent resistance of the combination of resistors is less than the resistance of any one of the three resistors.
C.   The voltage across each of the resistors is the same and is equal in magnitude to the voltage of the battery. The equivalent resistance of the combination of resistors is less than the resistance of any one of the three resistors. The algebraic sum of the currents flowing through each of the three resistors is equal to the current supplied by the battery.
D.   The current flowing through each of the resistors is the same and is equal to the current supplied by the battery. The voltage across each of the resistors is the same and is equal in magnitude to the voltage of the battery. The equivalent resistance of the combination of resistors is greater than the resistance of any one of the three resistors.
Question #6
As additional resistors are connected in series to a constant voltage source, how is the power supplied by the source affected?
A.   The effect on the power supplied by the source cannot be determined without knowing the voltage of the source.
B.   The power supplied by the source decreases.
C.   The power supplied by the sources remains constant.
D.   The power supplied by the source increases.
Question #7
As additional resistors are connected in parallel to a constant voltage source, how is the power supplied by the source affected?
A.   The power supplied by the source decreases.
B.   The effect on the power supplied by the source cannot be determined without knowing the voltage of the source.
C.   The power supplied by the sources remains constant.
D.   The power supplied by the source increases.

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