A light bulb is rated at 100W for a 220V supply. The resistance of the bulb is ___ Ohm.
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the resistance of the bulb is 484 ohms.
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According to the question, the power rating of the bulb is 100 watts, and the rms value of the voltage across the bulb is 220 volts. So, substitute P=100 watts and Vrms=220 volts in the formula P=V2rmsR to determine the resistance of the bulb. Hence, the resistance of the bulb is 484 ohms
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