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How to find unknown parrallel Resistor

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jeepnjeff

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Heres my problem I am able to figure total resistance of 75ohms using R=E/I and I know how to solve for power when I have the Resistor total. But for the life of me I cant figure out how to find missing resistor without pluging random numbers in until I get one close. How do I do this?
 

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Pommie

Well-Known Member
Most Helpful Member
You can calculate the voltage across R2 and use P=V²/R.

Edit, I didn't see any missing resistor.

Mike.
 
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Arumugam

New Member
Hi,
The parallel combination is in series with 65E.Find Req for parallel combination.Find the I total and it is 0.6A.find the voltage drop across 65E and it is 39V.So 6V drops there in parallel combination.Since all resistance in parallel same potential will exist in R1,R2,R3.Find power for R2 by using V^2/R
V^2=36,R=21.P=36/21=1.714W
 
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