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()how how would you join three Jesistors, each of resistance 9 Ω so that theequivalent resistance of the combination is (i) 13.5 Ω, (ii) 6 Ω ?ORWrite Joule's law of heating.Two lamps, one rated 100 W; 220 V, and the other 60 W; 220 V, are connectedin parallel to electric mains supply. Find the current drawn by two bulbs fromthe line, if the supply voltage is 220 V.(a)(b)

Answer»

a.Joule's law of heating states that the heat produced in a wire is directly proportional to the product of sqaure of current flowing through it and the resistance offered by it.b. for the first bulb, P1=100W, V=220VI1V=100or, I=100/220= 0.45Afor 2nd bulb,P2=60W, V=220VI2=60or, I2=60/220=0.27A



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