% Author: Dr. Matthias Jung, DL9MJ
% Year: 2020
\begin{circuitikz}[american]
    \draw (0, 1) node [ocirc](I1){};
    \draw (0,-1) node [ocirc](I2){};
    \draw (I1) to [european resistor, l={$R_1$}] ++(3,0) coordinate(C1);
    \draw (C1) to [short] ++(1,0)
               to [european resistor, l={$R_3$}] ++ (0,-2)
               to [short] (I2);
    \draw(C1) to [european resistor, l_={$R_2$}, *-*] ++(0,-2);
\end{circuitikz}