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11 Dec 2019
A small bulb is rated at 7.5 W when operated at 125 V. The tungsten filament has a temperature coefficient of resistivity a = 4.5x10^-3 / C. When the filament is hot and glowing, its temperature is seven times room temperature (20 C). What is the resistance of the filament (in ohms) at room temperature?
A small bulb is rated at 7.5 W when operated at 125 V. The tungsten filament has a temperature coefficient of resistivity a = 4.5x10^-3 / C. When the filament is hot and glowing, its temperature is seven times room temperature (20 C). What is the resistance of the filament (in ohms) at room temperature?
VikasLv10
23 Mar 2021
