In Figure P1521 the impedances are Z1 35 j20 V; Z2 70 j20

In Figure P15–21 the impedances are Z1 ¼ 35 þ j20 V;

Z2 ¼ 70 þ j20 V, and Z3 ¼ 270  j90 V. Find the average power delivered to Z3.