Many faces of the maximum power transfer theorem

The celebrated maximum power transfer theorem, which is usually stated for source impedance Zg = Rg + jXg and load impedance ZL = RL + jXL, is revisited, and generalised for other possible situations in which either Zg or ZL or both are parallel combinations of a resistance and a reactance, and for all possible cases of load variability. Many of the results are believed to be new