Fundamentals of Electrical Engineering Circuit Basics Question

[Varro]

"Fundamentals of Electrical Engineering" Circuit Basics Question

Homework Statement

I am asked to find p1, p2, p3, p4.

Homework Equations

p=vi
ƩP=0

The Attempt at a Solution

p1=(5)(-9)
=-45
p2=(2)(9)
=18
p4=(3)(5)
=15

p3=v(.6i)
=v(.6(4))
=v(2.4)
I know that v=5 and p3=12, but I don't know why v=5.

I do perfectly fine finding p1, p2, and p4, but I am having difficulty figuring out how to find the voltage on p3 to get the power. I am trying to refrain from using the law of the conservation of energy (ƩP=0), since a previous example I tried to figure out before gave me the same problem.

 

[gneill]

The diagram shows I = 5A. So the voltage on the controlled source should be 5*0.6 = 3V.

 

[Varro]

The diagram shows I = 5A. So the voltage on the controlled source should be 5*0.6 = 3V.

I am talking about the dependent voltage source, p3. The current is labeled as 4A.

 

[gneill]

I am talking about the dependent voltage source, p3. The current is labeled as 4A.

Yes, the current through the controlled source is labelled as 4A. But the controlled source voltage is stated to be 0.6I, and I = 5A.