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1: A small bulb is rated at 750 W when operated at 125 V.The tungsten filament has a temperature Problem coefficient of resistivity a 450x10 3/ce. When the filament is hot and glowing, itstemperatureis seven times room temperature (20 C°). What is the resistance of the filament (in ohms) at room temperature?

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Answer #1

and v= 125v Given: P = 7.50W Since: P=v² R= V2 = (125) 2083.332 P 7.5 and a=4.5x10 3 100 there, I = 7(20°C) = 140°C Since RER
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