Element A in the diagram absorbs


Element A in the diagram absorbs 30 W of power. Calculate V_x.

Element A in the diagram absorbs

Solution:

In our question, element A absorbsĀ power which means current should be entering the positive terminal, however, we can see that in the diagram, current is in fact going in the opposite direction.

We know that p=vi

We need to find V_x so we will isolate for v.

V_x=\frac{p}{i}

Substituting our values gives us:

V_x=\frac{30W}{-2A}

V_x=-15v

This question can be found in Basic Engineering Circuit Analysis, 10th edition, chapter 1, question 1.23.

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