% Author: Prof. Dr. Mathtias Jung, DL9MJ
% Year: 2025
\begin{circuitikz}[american, straight voltages]
    \draw (0,0) node[transformer core](T){};
    %
    \draw (T.A1) to [short, -o] ++(-1,0) coordinate(a1) to [open] ++(-1,0);
    \draw (T.A2) to [short, -o] ++(-1,0) coordinate(a2) to [open] ++(-1,0);
    \draw (T.B1) to [short, -o] ++(+1,0) coordinate(b1) to [open] ++(+1,0);
    \draw (T.B2) to [short, -o] ++(+1,0) coordinate(b2) to [open] ++(+1,0);
    %
    \draw(T-L1.south) node[anchor=east]{$N_P$};
    \draw(T-L2.south) node[anchor=west]{$N_S$};
    %
    \draw(a1) to [open, v={$U_P$}] (a2);
    \draw(b1) to [open, v={$U_S$}] (b2);
\end{circuitikz}