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Question 1.P.60: For the given circuit, calculate ∑ k=1^3 vx ix ...

For the given circuit, calculate

\sum_{k=1}^3 v_x i_x

1.60
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From the circuit, we have

\begin{aligned} \sum_{k=1}^3 v_x i_x & =v_1 i_1+v_2 i_2+v_3 i_3=-20 \times 3+15 \times 3+5 \times 3 \\ & =-60+45+15=0  W \end{aligned}

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