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Network Theorems (AC Circuits) D C Kulshreshtha

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Maximum Power Transfer Theorem for AC Circuits Next

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The power delivered to the load is Phasor current and voltage are where

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A little forethought saves us some work. (X Th + X L ) absorbs no power; any nonzero value only reduces P L. Hence we can put X L = - X Th, so as to get

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This expression, we have already maximized for purely resistive case, by selecting R L = R Th. Hence, we must have

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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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