For the light bulb measurements illustrated in Figure 2, which best describes th

Question

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.

in the second experiment, the student replaces the resistor with a light bulb and proceeds to measure the current for various voltages once again. The new circuit and the resulting current vs. voltage graph are shown in Figure 2 below. Voltage (a) (b) Figure 2

Explanation / Answer

We know that ohm's law is V=(IR)

Here R = resistance of the bulb ; V = voltage applied ; I = current through the bulb

From the given graph,line is a non-linear curve & also here slope of the curve = (I/V) = (conductance of the bulb)

Conductance = (1/Resistance) [G=(1/R)]

Here G increases gradually,hence R decreases i.e., resistance decreases

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