The resistance of a filament of a bulb is 200 2 when the bulb is lit up and 12 N when it is not lit. Calculate the temperature of the filament when alight. The room temperature is 30° C and the temperature coefficient of the filament is 4.5 x 103 °C'.

The resistance of a filament of a bulb is 200 2 when the bulb is lit up and 12 N when it is not lit. Calculate the temperature of the filament when alight. The room temperature is 30° C and the temperature coefficient of the filament is 4.5 x 103 °C'.

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter22: Electric Current

Section: Chapter Questions

Problem 73A

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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

ii)
The resistance of a filament of a bulb is 200 N when the bulb is lit up
and 12 2 when it is not lit. Calculate the temperature of the filament
when alight. The room temperature is 30° C and the temperature
coefficient of the filament is 4.5 x 103 °C'.

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