For the network in Fig. 7.71: a. Find currents I, , and Ig. h. Find voltages V, and Vs. Find the power delivered to the 3 kn resistor. Answer all hebe a,bc 9 kn Rs 6 kn + V.- E = 28 VE R,3 kn 12 kn R10.4 k 12 kn FIG. 7.71 Problem 12.

? Vth + Vab Two measurements are made on an unknown two-terminal device: = 。a 1. When a 2mA current source is connected between nodes a and b with positive current flowing into node b, the voltage is measured to be 48mV with the higher voltage at node a. 2. When a 322 resistor is connected between nodes a and b, the current is measured to be 5mA with current flowing down (from a to b). What are the Thevenin equivalent voltage and resistance of the two-terminal device? ob Rth =

252 III SERIES-PARALLEL NETWORKS O +120 V *30. Determine the voltage divider supply resistors for the configuration of Fig. 7.93. Also determine the required wattage rating for each resistor, and compare their levels. 10 mA 20 mA R 100 V 40 mA 180 V 40 V 36 V 4 mA FIG. 7.93 Problem 30. CECTI