% Author: Dr. Matthias Jung, DL9MJ
% Year: 2022
\begin{circuitikz}[american]
    \draw (0,1)  to [european resistor, l={$R_\mathrm{1}$},  o- ] ++(3,0) coordinate(C1)
                    to [european resistor, l={$R_\mathrm{3}$},   -o] ++(3,0);
    \draw (C1)   to [european resistor, l_={$R_\mathrm{2}$}, *-*] ++(0,-2);
    \draw (0,-1) to [short, o-o] ++(6,0);
\end{circuitikz}