In this circuit, made using CircuiTikZ
,
\documentclass{article}
\usepackage[american,siunitx]{circuitikz}
\usetikzlibrary{positioning}
\usepackage{siunitx}
\begin{document}
\begin{circuitikz}
\draw
(0,6) to [short,*-] (1,6)
(0,0) to [short,*-] (1,0)
(0,6) node [left] {$A$}
(0,0) node [left] {$B$}
(0,0) to [european voltages,open,v^=$v$] (0,6)
;
\end{circuitikz}
\end{document}
the arrow indicating the voltage between A and B is too short, due to the distance of the two extreme points. Is there a way to extend the length of the arrow, so that its ends could be nearer to A and B?