Compute the power that is absorbed or supplied by the elements in the network
Image from: Irwin, J. David., and R. M. Nelms. Basic Engineering Circuit Analysis, Tenth Edition. N.p.: John Wiley & Sons, 2010. Print.
Solution:
Remember that power is current multiplied by the voltage.
P_{36v}=-36(4)=-144W
(Negative because current enters the negative terminal, which also means power is being supplied)
P_1=12(4)=48W
(Power is absorbed)
P_2=24(2)=48W
(Power is absorbed)
P_{1I_{x}}=(-I_x)(2)=-4(2)=-8W
(Power is supplied)
P_3=28(2)=56W
(Power is absorbed)