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## Homework Statement

Using symbols, write P

_{RL}, the power dissipated in R

_{L}as a function of R

_{L}(your other symbols are R

_{0}and the power supply voltage epsilon both of which are constant. 10V and 100ohms) and then take the derivative of this function with respect to R

_{L}for which P

_{RL}has an extreme value, in this case a maximum.

## Homework Equations

V = IR

## The Attempt at a Solution

So here's what I was thinking...

P

_{RL}= VI where I = V/R so replace that with Epsilon

^{2}/R

_{0}

Then plug in the constant values 10V and 100ohms to get P

_{RL}= 1W dR

_{L}

Not sure where to go from here though as the derivative gives zero. What am I missing? Did I do it all incorrectly? Thanks in advance!