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Temperature Coefficient of Resistance
10 questions By Tony R. Kuphaldt
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Question 10 of 10
An incandescent light bulb has a filament resistance of 5.7 Ω when at room temperature (20o C), but draws only 225 mA when powered by a 12 volt DC source. Given that the filament is made out of tungsten metal, calculate its temperature in degrees F when powered by the 12 VDC source.
Reveal answerT = 3,484oF
Notes:Solving this problem requires several concepts be integrated: Ohm’s Law, converting between different temperature units, and calculating temperature from shift in resistance.
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