Figure P1–22 shows an electric circuit with a voltage and a current variable assigned to each of the six devices. Use power balance to find v4 when v1 ¼ 20 V, i1 ¼2 A, p2 ¼ 20 W, p3 ¼ 10 W, i4 ¼ 1 A, and p5 ¼ p6 ¼ 2.5 W. Is device 4 absorbing or delivering power?

AppendixLO1