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**Network Theorems (AC Circuits)**

D C Kulshreshtha

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**Maximum Power Transfer Theorem for AC Circuits**

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**The power delivered to the load is**

Phasor current and voltage are where Next

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**A little forethought saves us some work**

A little forethought saves us some work. (XTh + XL) absorbs no power; any nonzero value only reduces PL. Hence we can put XL = - XTh, so as to get Next

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This expression, we have already maximized for purely resistive case, by selecting RL = RTh. Hence, we must have Next

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Exercise Show that if the load is purely resistive in an ac circuit, the condition for maximum power transfer is Next

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