Physics, 21.08.2021 17:50 dedrenabouyer
A light bulb is rated at 6.40 W when operated at 66 V and the tungsten filament becomes hot and glowing at 140 ∘C. What is its resistance (in ohms) at 20 ∘C if the tungsten has a temperature coefficient of resistivity α=4.5×10−3 ∘C−1.
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