circuitikz宏包绘制滑动电阻问题及微调元件位置

好像调对了，但不知原理。

\documentclass{ctexbook}
\usepackage{circuitikz}
\begin{document}
    \begin{circuitikz}[european]
        \draw(0,0)to[rmeter,t=A](0,2)to[R,l_=$R$](3,2)to[pR,l_=$R'$,n=pr](4.1,2);
        \draw(0,0)to[normal open switch](6,0)|-(pr.wiper);
    \end{circuitikz}
\end{document}

本着学习的心态，我咨询了 TSE 上circuitikz的大神 @cis

这里的目标是要实现「单端的」电位器元件Potentiometer，可以只使用其genericpotentiometershape 这一底层的 PGF 节点形状：

其他内容手动使用tikz的路径实现即可：

% https://ask.latexstudio.net/ask/question/17966.html
% https://tex.stackexchange.com/a/757977/322482
\documentclass[margin=5pt, multi=circuitikz]{standalone}
\usepackage{circuitikz}
\begin{document}
\begin{circuitikz}[
    european,line width=1pt,line cap=round,
    circuitikz/bipoles/thickness=1,% default = 2
    % https://tex.stackexchange.com/a/758070/322482
    % circuitikz/resistors/width=0.7,% default 0.8 ---> R and pR
    circuitikz/bipoles/generic potentiometer/height 2=0.2,% default 0.3 --> only pR
    % circuitikz/bipoles/generic/width=0.7,% default 0.8 --> only R
    circuitikz/bipoles/generic/height=0.2,% default 0.3 --> only R
]
    % R and Potentiometer
    \draw (0,0) 
        to [rmeter, t=A, -*] (0,2) coordinate(A)
        to [R, l_=R, name=r] (3,2) -- (4,2)
        node[
            genericpotentiometershape, %<-
            anchor=west, label=below:R${}^\prime$,
        ] (pr) {};
    % Battery and Potentiometer tap
    \draw (0,0) 
        to[battery1] (3,0) 
        to[normal open switch, l_=S, n=S] (6,0) 
        |-(pr.wiper);
    % Voltmeter
    \coordinate (M)  at ($(r)!.5!(pr)$);
    \draw
    (A) -- ++(0,1) coordinate(B) 
    to[rmeter, t=V]  (B -| M) 
    -- (M) node[circ] {}; % node style circ <=> `-*'
\end{circuitikz}
\end{document}