A 2.0 cm long tungsten filament in a florescent light bulb has a radius of 0.3 mm. Assume constant 20 degree Celsius temperature during operation of the light bulb. 1 Calculate the cross-sectional area of the filament. 2Calculate the resistance of the wire.

A 2.0 cm long tungsten filament in a florescent light bulb has a radius of 0.3 mm. Assume constant 20 degree Celsius temperature during operation of the light bulb. 1 Calculate the cross-sectional area of the filament. 2Calculate the resistance of the wire.

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter9: Current And Resistance

Section: Chapter Questions

Problem 91CP: A student uses a 100.00-W, 115.00-V radiant heater to heat the student’s dorm room, dining the hours...

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.

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