\begin{problem*}{28.26}
The following equations describe an electric circuit:
\begin{align}
  -I_1 (220\U{\Ohm}) + 5.80\U{V} - I_2 (370\U{\Ohm}) &= 0 \\
  +I_2 (370\U{\Ohm}) + I_3 (150\U{\Ohm}) - 3.10\U{V} &= 0 \\
  I_1 + I_3 - I_2 &= 0
\end{align}
\Part{a} Draw a [possible] diagram of the circuit.  \Part{b}
Calculate the unknowns sand identify the physical meaning of each
unknown.
\end{problem*}

\begin{solution}
\end{solution}
