If the 0.12-mm-diameter tungsten filament in a light bulb is to have a resistance of 0.2 2 at 20°C,how long should it be?The resistivity of tungsten is at 20°C is 5.6 x 10-8 22.m.L=m

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the 0.12-mm-diameter tungsten filament in a light bulb is to have a resistance of 0.2 £ at 20°C, ow long should it be? he resistivity of tungsten is at 20°C is 5.6 x 10-8 .m. = m

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter28: Current And Resistance

Section: Chapter Questions

Problem 57PQ

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Concept explainers

Temperature Variance of Resistance

Electrical resistance or simply resistance is the property of a material that opposes the free flow of electrons through it. The total amount of resistance to the flow of charges (or current) is affected by many factors like the length of the conducting material, its cross-sectional area, resistivity, and temperature.

Question

If the 0.12-mm-diameter tungsten filament in a light bulb is to have a resistance of 0.2 2 at 20°C,
how long should it be?
The resistivity of tungsten is at 20°C is 5.6 x 10-8 22.m.
L=
m

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