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

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

College Physics
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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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]
Transcribed Image Text: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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