Please consider the below MWE:
\documentclass[border={1mm},multi=circuitikz]{standalone}
\usepackage[europeanresistors,siunitx]{circuitikz}
\begin{document}
\begin{circuitikz}
\coordinate (N1) at (0,0);
\coordinate (N2) at (0,-4);
\coordinate (N3) at (-4,-4);
\coordinate (N4) at (0,-8);
\draw (N1)to [R,o-o](N2);
\draw (N2)to [R,o-o](N4);
\draw (N4)to [R,o-o](N3);
\draw (N3)to [R,o-o](N1);
\draw (N2)to [R,o-o](N3);
\draw (N1)to [R,o-o,bend left=60](N4);
\end{circuitikz}
\end{document}
This is the output:
But there is no component on the curved line!?
node
for, though.