*7. Using superposition, find the voltage across the 6 A source in Fig. 125. = 24 V Rs 42 + V, - E, R R2 E, - 12 V 60 42 +8 V 1= 6A R3 30 2 R4120 FIG. 125 Problem 7. SECTION 3 Thévenin's Theorem "ork in 8. a. Find the Thévenin equivalent circuit for the network ex- ternal to the resistor R in Fig. 126. b. Find the current through R when R is 2 0, 30 2, and 100 Ω. Ry 4 2 E : R; 30 18 V Mohammed ali Ahmed

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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.