The filament of anincandescent lightbulb is a thin tungsten


The filament of anincandescent lightbulb is a thin tungsten wire. Suppose a lightbulbhas a resistance of 42 Ω at room temperature. During normal operation, the filament reaches atemperature of about 2990 K.

a) What is its resistance at that temperature? The temperature coefficient of resistivity for tungsten isα = 4.5 x 10-3K−1.

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Physics: The filament of anincandescent lightbulb is a thin tungsten
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