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A common flashlight bulb is rated at 0.39 A and 3.0 V (the values of the current and voltage under operating conditions). If the resistance

A common flashlight bulb is rated at 0.39 A and 3.0 V (the values of the current and voltage under operating conditions). If the resistance of the bulb filament at room temperature (20C) is 1.2 , what is the temperature of the filament when the bulb is on? The temperature coefficient of resistivity is 5.7 10-3 K-1 for the filament material.

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