\begin{texdraw}
\drawdim cm

% abcisas
\move(-0.5 0)
\avec(2 0)
\rmove(0 -0.2)
\textref h:C v:T \htext{$t$}

% ordenadas
\move(0 -0.5)
\avec(0 2.6)
\rmove(-0.2 0)
\textref h:R v:C \htext{$i(t)$}

\move(0 0)
\larc r:1 sd:0 ed:45

\move(0.5 0.3) \textref h:L v:C
\htext{$\alpha$}
\move(1.1 0.5)
\htext{$\tan \alpha = \frac{1}{L}$}

% La linea gruesa
\linewd 0.075
\move(-0.5 0)
\lvec(0 0)
\lvec(2 2)

\end{texdraw}