P 5.6-4 For the circuit in Figure P 5.6-4, prove that for R_s variable and R_L fixed, the power dissipated in R_L is maximum when R_s =0.

Figure P 5.6-4

We can find the power dissipated in R_L by the equation

Current is found from

will increase as the denominator decreases, so if we can only vary R_s, the smallest denominator will be when R_s =0!

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