Use the DA2 plot to evaluate the idea that the main reason that the resistance o

Question

Use the DA2 plot to evaluate the idea that the main reason that the resistance of the lightbulb changes is NOT Current or Voltage but some other quantity of the lightbulb which we have not measured. Identify this quantity and explain why you suspect this is the real reason the lightbulb changes resistance. (Hint: this is related to the difference between the orange and blue dots. Also, this quantity is approximately the same for an entire color of dots, while for the other color this quantity changes significantly).

Resistance of Bulb vs Current of Bulb at Cold and Hot Measurement 35 30 25 20 15 10 Cold Hot 0.02 0.04 0.06 0.08 0.12 0.14 Current of Bulb (Amps)

Explanation / Answer

This looks like an experiment based question. As we are talking about bulb here. I assume the bulb is having a filament. The quanity which may change the resistance of a bulb is temperature. As the temperature of the filament increases over time, the resistance also increase thus reducing the current.

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