% Author: Prof. Dr. Matthias Jung, DL9MJ
% Year: 2025
\begin{circuitikz}
    \draw(0,0) coordinate(start)
        to [short, o-] ++(1,0) coordinate(i1)
        to [european resistor,l=$R_i$, v=$U_i$] ++(2,0) coordinate(i2)
        to [rmeter, t=A] ++(0,-1) coordinate(x2)
        to [short] (x2-|i1) coordinate(x3)
        to [short, -o] (x3-|start);
    \begin{scope}[on background layer]
        \draw[dashed, DARCblue, fill=DARCblue!20](i1)
            -- ++(0,0.25) coordinate(h1)
            -- (h1-|i2) coordinate(i3) 
            -- ++(0.5,0) coordinate(h2)
            -- (h2|-x2)
            -- ++(0,-0.25) coordinate(h3)
            -- (h3-|i1) node[midway, below](){Reales Strommessgerät}
            -- cycle;
    \end{scope} 
\end{circuitikz}