SOLUTION: Hi, This is pretty basic, but I have forgotten my algebra. I wish to substitute in ohm's law formulae to find soultions for power. given. E=IR and P=EI In an electrical circu

Question 490930: Hi,
This is pretty basic, but I have forgotten my algebra.
I wish to substitute in ohm's law formulae to find soultions for power.
given. E=IR and P=EI
In an electrical circuit only P and R are known. Solve for E and Solve for I.
I know the answers are E=√PR and I=√P/R but I don't remember how to solve for them.
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
given. E=IR and P=EI
In an electrical circuit only P and R are known. Solve for E and Solve for I.
:
E = I*R
R =
I =
:
solving for E using P & R
EI = P
E =
Replace I with (E/R)
E =
which is
E =
multiply both sides by E
E^2 = PR
Find the square root of both sides
E =
:
Solving for I using P & R
EI = P
I =
Replace E with IR
I =
multiply both sides by I
I^2 =
Find the square root of both sides
I =
:

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