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Do not search from internet .....The resistance of hot filament of bulb is about 10 times the cold resistance .what will be the resistance of 100W-220V lamps ,when not in use. ​

Answer»

R= V²/PR= 220×220/100R= 484ohm.It is GIVEN resistance of hot lamp is 10 times the cold lamp.Hence, R cold = 484/10 = 48.4 ohm ans.. HOPE IT HELPS..



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