27. Resistors & DC Circuits
Power in Circuits
9:07 minutes
Problem 25.82
Textbook Question
Textbook QuestionA 100-W, 120-V incandescent lightbulb has a resistance of 12 Ω when cold (20°C) and 150 Ω when on (hot). Calculate its power consumption
(a) at the instant it is turned on, and
(b) after a few moments when it is hot.
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