\begin{circuit}1

%Inductor
\cc\nl \L1 {$v_L(t)$} * d
\- 1 d

\atpin L1*
\- 1 u

% Corriente
\frompin L1. \shift -1.5 -1
\nl \whatI1 {$i_L(t)$} d u
\vtopin L1*
\- 1 u 

% Tension

\atpin L1* \shift 0.5 0
\put{$+$}

\atpin L1. \shift 0.5 -0.5
\put{$-$}


\end{circuit}