% Author: Dr. Matthias Jung, DL9MJ
% Year: 2020
\begin{circuitikz}
    \draw(0,0) coordinate(U1B) 
        to [short,o-] ++(3,0) coordinate(d2)
        to [short,-o] ++(1.5,0) coordinate(U2B);
    \draw(0,3) coordinate(U1A) 
        to [R,l_={$R_\mathrm{V}$}, o-] ++(3,0) coordinate(d1)
        to [short, -o] ++(1.5,0) coordinate(U2A);
    \draw(d2) 
        to [stroke Zener diode, mirror, i^<={$I_\mathrm{Z}$}, *-*] (d1);
    
    \draw(U1A) node[anchor=east](){+\qty{13,8}{\volt}};
    \draw(U1B) node[anchor=east](){\qty{0}{\volt}};
    \draw(U2A) node[anchor=west](){+\qty{5}{\volt}};

    \draw(U1A) to[open, v=$U_1$] (U1B);
    \draw(U2A) to[open, v^=$U_\mathrm{Z}$] (U2B);
\end{circuitikz}