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$$
\begin{array}{l}{\text { Use a Y-to- } \Delta \text { transformation to find the voltage }} \\ {v \text { in the circuit shown. }}\end{array}
$$

$$
R_{a}=5+10+\frac{5 * 10}{20}=17.5 \Omega
$$

$$
R_{b}=20+5+\frac{20*5}{10}=35 \Omega
$$

$$
R_c=20+10+\frac{20*10}{5}=70 \Omega
$$

$$
R_{eq}=\frac{28 * 70}{28+70}=20 \Omega
$$

$$
R_{eq}=\frac{17.5* 10{5}}{17.5+105}=15 \Omega
$$

$$
R_{eq}=20+15=35 \Omega
$$

$$
R_{e q}=\frac{35}{2}=17.5 \Omega
$$

$$
V=I R=2 * 17.5
$$

$$
V=35 V
$$

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