Part A) For the light bulb measurements illustrated in Figure 2, which best desc

Question

Part A)

For the light bulb measurements illustrated in Figure 2, which best describes the variation of the resistance as the voltage increased?
A. First the resistance increases, then it decreases.
B. First the resistance decreases, then it increases.
C. The resistance decreases.
D. The resistance increases.
E. The resistance is constant, i.e., independent of the voltage.

Part B)

For the light bulb measurements illustrated in Figure 2, which best explains the variation of the resistance as the voltage increased?
A. The length of the filament in the light bulb increases with increasing voltage.
B. The thickness of the filament in the light bulb increases with increasing voltage.
C. The length of the filament in the light bulb decreases with increasing voltage.
D. The thickness of the filament in the light bulb decreases with increasing voltage.
E. The temperature of the filament in the light bulb increases with increasing voltage.

Explanation / Answer

For part (A) Option D is correct.

For part (B)Option E is correct.

Resistance increases with increase of temperature.

With the increase of voltage more current flows through the filament so temperature increases. With the increase of temperature resistance also increases so flow of current decrases so graph is curved not straight. The flow of current now not proportional to applied voltage.

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