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Network Theorems (AC Circuits) D C Kulshreshtha
Maximum Power Transfer Theorem for AC Circuits Next
The power delivered to the load is Phasor current and voltage are where
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
This expression, we have already maximized for purely resistive case, by selecting R L = R Th. Hence, we must have
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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