Network Theorems (AC Circuits)

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Presentation transcript:

Network Theorems (AC Circuits) D C Kulshreshtha

Maximum Power Transfer Theorem for AC Circuits Next

Next

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

Next

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

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

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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