A small bulb delivers an electrical power of 7.5 W when operated at 125 V. The tungsten filament has a temperature coefficient of resistivity of alpha = 4.5 x 10 ^ (- 3 / ° C) When the filament is hot bright, its temperature is seven times the ambient temperature of a room (20 ° C). What is the resistance of the filament (in ohms) at room temperature? a. 5630 b. 4530 c. 1911 d. 1280

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Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.