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I need some help answering this question from the experiment 3: Ohm's Law In part B, the resistance of the light bulb changed as the

I need some help answering this question from the experiment 3: Ohm's Law

In part B, the resistance of the light bulb changed as the voltage (and current) changed. Why does this resistance change occur? Is the percent difference between the resistance at maximum voltage and the resistance at zero voltage affected by frequency? Why or why not?

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