A small bulb is rated at 5.9 W when operated at 125 V. The tungsten filament has a temperature coefficient of resistivity a = 4.5 x 10-3/ °C. When the filament is hot and glowing, its temperature is 122 °C. Calculate the following (In canvas enter only the answer to part b) a) The resistance of the filament when it is at the operating temperature. b) The resistance when the temperature of the filament drops to 20°C (i.e. when the lamp is off). c) At 10 cents per kWh, what will be the cost of operating the light-bulb for 100 hours.

A small bulb is rated at 5.9 W when operated at 125 V. The tungsten filament has a temperature coefficient of resistivity a = 4.5 x 10-3/ °C. When the filament is hot and glowing, its temperature is 122 °C. Calculate the following (In canvas enter only the answer to part b) a) The resistance of the filament when it is at the operating temperature. b) The resistance when the temperature of the filament drops to 20°C (i.e. when the lamp is off). c) At 10 cents per kWh, what will be the cost of operating the light-bulb for 100 hours.

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

A small bulb is rated at 5.9 W when operated at 125 V. The tungsten filament has a temperature
coefficient of resistivity a = 4.5 x 10-3/ °C. When the filament is hot and glowing, its temperature is
122 °C. Calculate the following (In canvas enter only the answer to part b)
a) The resistance of the filament when it is at the operating temperature.
b) The resistance when the temperature of the filament drops to 20°C (i.e. when the lamp is off).
c) At 10 cents per kWh, what will be the cost of operating the light-bulb for 100 hours.

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