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I'm investigating maximum power transfer in a AC circuit. I understand that for maximum power transfer the reactance both cancel each other out and the value of the source resistance and load resistance have to be equal. I have also found some formulas to prove this.

what i would like to know is why when either the source inductance or load capacitance is increased the value for the maximum power transfer is different. I have produced some graphs from a simulation. with Xl=Xc, Xl doubled and Xc doubled.

when Xl=Xc the maximum power is when the resistors are the same. If I keep the resistors the same and double either of the reactance the maximum power is less and happens at a higher resistance. why is this?

many thanks

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# I'm investigating maximum power transfer in a AC circuit

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