Question

What is resistance offered by a 100 W bulb if the line voltage is 220V

Answer 1

P = V2/R  
If V = 220 V we have

100 W = 2202/R
R = 2202/100 Ω = 484 Ω. This is the resistance of the bulb.

When V = 110 V, power consumed =  V2/R = 1102 /484 = 25 W

Answer 2

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