The filament of an incandescent lightbulb is a thin tungsten wire. Suppose a lig
ID: 2279823 • Letter: T
Question
The filament of an incandescent lightbulb is a thin tungsten wire. Suppose a lightbulb has a resistance of 45 ? at room temperature. During normal operation, the filament reaches a temperature of about 3060 K.
The filament of an incandescent lightbulb is a thin tungsten wire. Suppose a lightbulb has a resistance of 45 ? at room temperature. During normal operation, the filament reaches a temperature of about 3060 K. What is its resistance at that temperature? The temperature coefficient of resistivity for tungsten is ?Explanation / Answer
room temp is 25C or 298K
Rt = Ro(1 + ??T)
Rt = 45(1 + 4.5e-3*(3060
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