. \documentclass{standalone}  \usepackage{tikz} \usepackage{circuitikz}  \begin{document}  \begin{circuitikz}[line width=0pt] \draw[line join=miter] (0,0) to[V=$U$] ++(0,0) to[R=$R_i$, -*] ++(0,0)  to[short, i=$I$] ++(0,0) to[R=$R_u$] ++(0,-0) to[short, -*] ++(-0,0) 