Solve the following questions given below hera
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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2 Answers
total resistance=15*20=300ohm
voltage=150V
Current =voltage/resistance
150/300=0.5A
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Answered
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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