Question: A certain generator with an internal resistance r delivers a voltage E . This generator is connected to an electric circuit with a resistance R

A certain generator with an internal resistance r delivers a voltage E. This generator is connected to an electric circuit with a resistance R. The work W done each second in sending a current through a circuit with resistance R is given by W=E2R(R+r)2. For constant r and E, show that W is a maximum when R=r. Sketch a graph of W as a function of R.
A certain generator with an internal resistance r

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