The load ZL consumes an apparent power with a magnitude |S = 150 VA at a power factor 0.846 lagging. What impedance ZPFC is needed in parallel with Z, such that the load achieves unity power factor? 12040° V ZL ZPFC f = 60 Hz O j180.0 N O -j180.0 2 O-jl13.5 N O jl13.5 2

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Maximum power transfer theorem

A resistive load will consume maximum power from a network when the load resistance is equal to the resistance of the network as viewed from the open-circuit terminals, with all energy sources removed leaving only the internal resistances. Physicist Moritz von Jacobi introduced the maximum power transfer theorem in 1940. Therefore, this theorem is also known as Jacobi's law.