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A string of twenty 15 Ω Christmas tree lights is used for a party. One burns out, they all burns out. Calculate the resistance Also what will be the current flowing through it if 150 V battery is used.(2) |
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Answer» total resistance=15*20=300ohm voltage=150V Current =voltage/resistance 150/300=0.5A given one burns out and all burns out means connection is series. So Rnet = R1 +R2..... +R20 =20R = 20(15) = 300 ohm. as R1= R2 = R3= .......... R20= 15 ohm From ohms law V=IR Given V= 150 V R= 300 ohm Thus I= V/R = 150/300 = 0.5 A |
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