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27 Nov 2019

Problem 17.72

A tungsten lightbulb filament is designed to dissipate 40.0 W at a120-V potential difference.

Part A:
What's the filament current, assuming negligible resistance in therest of the circuit?
Express your answer to three significant figures and include theappropriate units.

Part B:
What is the filament's resistance when lit?
Express your answer to three significant figures and include theappropriate units.

Part C:
If the lit filament is at 1850 K, what's its resistance whenoff?
Express your answer to two significant figures and include theappropriate units.

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Collen Von
Collen VonLv2
17 Mar 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

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