Two electric circuits represented by boxes A and B are conne

Two electric circuits, represented by boxes A and B are connected as shown in the Figure. The reference direction for the current i in the interconnection and the reference polarity for the voltage v across the interconnection are as shown in (Figure 1) Determine the power associated with the box B for i = 7 A, v = 30 V Express your answer to three significant figures and include the appropriate units. State whether the power is flowing from A to B or vice versa Determine the power associated with the box B for i = -B A v = -20 V. Calculate the power in the interconnection Express your answer to three significant figures and include the appropriate units. State whether the power is flowing from A to B or vice versa

Solution

(G) p= power = v*i=4*55=-220 w

(F) power is flowing from B to A

(H) p= power associated to box B

P=9*40=360 w

(I) power flowing from B to A