19. (II) A 100-W lightbulb has a resistance of about 12 fl
Chapter 18, Problem 19(choose chapter or problem)
19. (II) A 100-W lightbulb has a resistance of about 12 fl when cold (20cC) and 140H when on (hot). Estimate the temperature of the filament when hot assuming an average temperature coefficient of resistivity a = 0.0060 (C0)"1.
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