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Answer to Question #6450 in Electric Circuits for Fainah
Question #6450
For a three-way bulb (60 W, 100 W, 160 W) that is designed to operate at 120 V, find the resistance of each of the two filaments. Assume that the wattage ratings are not limited by significant figures and ignore any heating effects on the resistances.
60 W filament________Ohms
100 W filament__________Ohms
60 W filament________Ohms
100 W filament__________Ohms
Expert's answer
Power
P=V2/R whence R=V2/P
60W filament 240 Ohms
100W filament 144 Ohms
P=V2/R whence R=V2/P
60W filament 240 Ohms
100W filament 144 Ohms
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