two bulbs are marked 40W-220V and 20W-110V the ratio of their resistances is
manishmalhotra:
sir what will be the answer ...How to solve this ...
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bulb1 : 40W -220v
P = V²/R
R = V²/P = 220²/40 = 1210 ohm
bulb2: 20W-110V
R = 110²/20 = 121×5 ohm
ratio= 1210/121×5 = 2:1
P = V²/R
R = V²/P = 220²/40 = 1210 ohm
bulb2: 20W-110V
R = 110²/20 = 121×5 ohm
ratio= 1210/121×5 = 2:1
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