Compute the power that is absorbed or supplied


Compute the power that is absorbed or supplied by the elements in the network

Compute the power that is absorbed or supplied

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)

 

This question can be found in Basic Engineering Circuit Analysis, 10th edition, chapter 1, question 1.33.

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