The Thevenin equivalent at terminals a-b of the linear network shown in Fig. 4.142 is to be

Question:

The Thevenin equivalent at terminals a-b of the linear network shown in Fig. 4.142 is to be determined by measurement. When a 10-kr/ resistor is connected to terminals a-b, the voltage Vab is measured as 6 V. When a 30-kfl resistor is connected to the terminals, Vab is measured as 12 V. Determine: (a) the Thevenin equivalent at terminals a-b, (b) Vab when a 20-kr/ resistor is connected to terminals a-b.