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Josh225

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Member advised to use the homework template for posts in the homework sections of PF.

I have been having trouble calculating the value of the voltage supply. From what I have learned, to calculate the value, it is V= I x R. I have already calculated the value of R2 as the problem asks, but how do I find the voltage supply if I only know the resistane and the power being distributed to R2?

I tried using P= V^2 / R1 to try to find V, but it didn't work out for me:

V^2= 81 (18)= 1458

V= √1458

V= 38.18

The book says the answer is 27

I tried using P= V^2 / R1 to try to find V, but it didn't work out for me:

V^2= 81 (18)= 1458

V= √1458

V= 38.18

The book says the answer is 27

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