Quote:
Originally Posted by jonnyGURU
Thanks smart ass. I got an A in algebra, perfect score on the exam and was a programmer for some years. That's not the point of my question.
I was just wondering if I could apply it to the electrical equations because the paper I was looking at was clearly trying to differentiate P = I^2 * R and V = I * R and I can't for the life of me understand why.

P = I * V is always true, V = I * R (Ohm's law) is not always; they are independent equations.
One can use Ohm's law to get variations
P = V^2/R
P = I^2 * R
but these depend on Ohm's law, and so are not always true; as such it is best to see the last 2 as derived, and not fundamental.