A PMMC type meter has a full scale deflection of 20 mA. The resistance of the coil is 400. So (1) Value of shunt for ameter of 55 A range and (2) Find the value of series resistance required for the range up to 550 V.

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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.