Engineering, 24.03.2020 20:54 Adeenieweenie

A small bulb is rated at 7.5 W when operated at 125 V. The tungsten filament has a temperature coefficient of resistivity α = 0.0045/°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?

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A small bulb is rated at 7.5 W when operated at 125 V. The tungsten filament has a temperature coeff...