- #1
Ognerok
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Homework Statement
While going through a basic electrical engineering overview, I came across the equation U = QV, which is defined to be electrical energy. For Power, which is explained in the next section, P is basically the derivative of U = QV. I tried following the derivation myself, but for some reason, what I got was different from the book.
Homework Equations
U= QV
q = -1.6x10^-19 Coulombs ( basically a constant)
The derivative of this turned out to be d/dt = V*d[Q]/dt. My question is HOW.
The Attempt at a Solution
P = d/dt = Q * d[v]/dt; treated Q as a constant, but this doesn't line up. My Calculus must be rusty. Anyway, the full statement from the book:
P = U'= V*Q' = VI= v^2/R = I^2*R
-Thanks.