For the circuit of Fig. 1-25, (a) determine the Thvenin equivalent of the circuit to the left of terminals a, b, and (b) use the Thvenin equivalent to find the load current i. Ans. (a) VTh = 120 V, Z = 20 2; (b) i = 4 A 50 0.25vab R = 10 2 30 V 10 2 Vab b. Fig. 1-25