using network theorems calculate the current in each branch at the network below viz RID DRZ R3 V=20v RI= S ohms R2=8ohms R3= 2.5 ohms

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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.