27. Resistors & DC Circuits
Resistors and Ohm's Law
12:12 minutes
Problem 26b
Textbook Question
Textbook Question(III) The filament of an incandescent lightbulb has a resistance of 12 Ω at 20°C and 140 Ω when hot.
(b) In this temperature range, what is the percentage change in resistance due to thermal expansion, and what is the percentage change in resistance due solely to the change in ρ? Use Eq. 25–5.
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