Question

the resistance of hot filament of the bulb is about 10 times the cold resistance. What will be the resistance of 100 W-220 V lamps, when not in use​

Answer 1

Explanation:

=V²/P= (200)²/100 =400 ohm

resistance when not in use = 400/10 = 40 ohm

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Answer 2

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Rcold=40010=40Ω :)