Question

2 bulbs of 100w120v and 10w 120v are connected in series through the 120 v supply. find the current through each bulb
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Answer 1

Answer:

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Answer 2

Explanation:

resistance of first bulb R1=V^2/P=120^2/100=1400/100=144ohms

resistance of second bulb R2=V^2/P=120^2/10=1400/10=1440 ohms

total resistance =1584ohms

total current I=total voltage /total resistance =120/1584=0.075A

voltage across first resistance =total current *resistance =0.0757*144=10.9volts

voltage across second resistance =total current *resistance =0.0757*1440=109volts

Now,

current at first bulb =voltage /resistance =10.9/144=0.0757A

current at second bulb =voltage /resistance =109/1440=0.0757A



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