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Electronic Theory and Principle Discussion of electrical theory, law, etc.

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Old 08-03-2012
dish_moose dish_moose is offline
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^+1 If things were too easy people without iron rings on their fingers could do it too. ;-)
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Old 12-22-2017
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ashiekh ashiekh is offline
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Originally Posted by jonnyGURU View Post
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.
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