By applying the knowledge illustrate with help of a vector diagram equation Vs=Vreq+jVxeq for lagging power factor load?      Needs Complete solution with 100 % accuracy.

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Z parameter

The Z-parameters that are the impedance parameters of a two-port network are defined by expressing the two-port voltages V1 and V2 in terms of two-port currents I1 and I2. The Z-parameters are calculated by open circuiting one of the two ports at a time henceforth they are called open-circuit impedance parameters.