SOLUTION: Two electrical resistors are connected in parallel. The resistance of one of them is 15 ohms and the resistance of the combination is 5 ohms. What is the resistance of the other re

Question 970063: Two electrical resistors are connected in parallel. The resistance of one of them is 15 ohms and the resistance of the combination is 5 ohms. What is the resistance of the other resistor?
1 1 1
-= - + -
r r^1 r^2
Found 2 solutions by macston, Alan3354:
Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
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=Total resistance; =value of resistor 1; =value of resistor 2
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Plug in values
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Cross multiply.
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Divide each side by 2.
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ANSWER: The other resistor is 7.5 ohms.

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
15R/(15+R) = 5
R = 7.5 ohms

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