12. A tungsten filament lightbulb (resistivity at 20°C of 5.6x10-8 Qm, temperature coefficient of 0.0045/°C) at20°C has a resistance of about 9.5 N.a. When you apply 120 V to it, what is the current through it? [12.6 A – this high current is why filamentlightbulbs are more likely to break when first turned on.]b. How much power does it use at this temperature? [1516 W – pretty bright]c. Current flowing through the filament heats it quickly, which increases the resistance. A tungsten filament isheated to about 2480 °C. How much power does it use now? [126 W]

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the current through it? a first turned on.] temperature? [1516 W

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Question

12. A tungsten filament lightbulb (resistivity at 20°C of 5.6x10-8 Qm, temperature coefficient of 0.0045/°C) at
20°C has a resistance of about 9.5 N.
a. When you apply 120 V to it, what is the current through it? [12.6 A – this high current is why filament
lightbulbs are more likely to break when first turned on.]
b. How much power does it use at this temperature? [1516 W – pretty bright]
c. Current flowing through the filament heats it quickly, which increases the resistance. A tungsten filament is
heated to about 2480 °C. How much power does it use now? [126 W]

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