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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) |
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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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