% Author: Prof. Dr. Matthias Jung, DL9MJ
% Year: 2024
\begin{circuitikz}
    \draw(0,0) 
        to [R, o-, l={$R_1$}] ++(2,0) coordinate(node1)
        to [short, *-] ++(0,0.5)
        to [R, l={$R_2$}] ++(2,0) 
        to [short, -*] ++(0,-0.5) coordinate(node2)
        to [short, -o] ++(0.5,0);
    \draw(node1)
        to [short, *-] ++(0,-0.5) coordinate(h)
        to [R, l={$R_3$}] (h-|node2)
        to [short] (node2);
\end{circuitikz}