A light bulb is connected to a 12-V battery.Because light bulbs are non-Ohmic,the resistance of the bulb is not constant,but increases as the bulb gets hotter.As the bulb heats up,which value remains unchanged?
A)The power consumed by the bulb.
B)The current through the bulb.
C)The voltage across the bulb.
D)All the above change.

Question

​A light bulb is connected to a 12-V battery.Because light bulbs are non-Ohmic,the resistance of the bulb is not constant,but increases as the bulb gets hotter.As the bulb heats up,which value remains unchanged?
A)​The power consumed by the bulb.
B)​The current through the bulb.
C)​The voltage across the bulb.
D)​All the above change.

Quizplus · Accepted Answer

The voltage across the bulb remains unchanged as it heats up because it is connected to a 12-V battery. The current flowing through the bulb will decrease as its resistance increases due to the non-Ohmic behavior, and the power consumed by the bulb will also decrease as a result of the decreasing current flow. Therefore, choices A and B are incorrect, and the correct choice is C.

​A Light Bulb Is Connected to a 12-V Battery

A Light Bulb Is Connected to a 12-V Battery