电路 - tikz 电路库如何显示回路电流方向和电阻标签

Question

我很难在 tikz 文档中找到这些。

如何标记电阻（上面是 R，下面是 3Ohm）。如何指示回路电流并指示其方向，如快照所示。

\documentclass{memoir}

\usepackage{tikz}
\usetikzlibrary{circuits.ee.IEC}
\usetikzlibrary{shapes,fit,arrows}


\begin{document}

    \begin{figure}
        \centering      
    \begin{tikzpicture}[circuit ee IEC, x=3cm,y=4cm,
    thick, 
    every info/.style={font=\footnotesize},
    set resistor graphic=var resistor IEC graphic,
    set diode graphic=var diode IEC graphic,
    set make contact graphic= var make contact IEC graphic]



        \draw (0,0)  to [voltage source={direction info={volt=20}}] ++(0,1);
        \draw (0,1)  to [resistor={info={$R$},ohm=3}]  (2,1);
        \draw (2,1)  to [voltage source ={direction info={volt=10}}]
(2,0);
        \draw (2,0)  to [resistor={info=$R$}] (0,0);    



    \end{tikzpicture}
    \caption{What is current in shown direction}
    \end{figure}

\end{document}

我想显示环路电流，如下所示

Answer 1

'在某些电路键后面加上后缀（例如info'，，ohm'详情请参阅手册），将注释放在组件的另一侧。

对于中间的圆弧，我认为手动绘制它可能是最好的方法，但在这里我说明了使用带有节点的自定义注释的使用：

\documentclass[tikz,border=5]{standalone}
\usetikzlibrary{circuits.ee.IEC,calc}
\begin{document}
\begin{tikzpicture}[circuit ee IEC, x=3cm, y=4cm, thick, 
  every info/.style={font=\footnotesize},
  set resistor graphic=var resistor IEC graphic,
  set diode graphic=var diode IEC graphic,
  set make contact graphic= var make contact IEC graphic,
  circuit declare annotation={circular annotation}{0}
    { (270:3/16) edge [to path={ arc (270:0:1/8) } ] () }]

\draw (0,0)  to [voltage source={direction info={volt=20}}] ++(0,1);
\draw (0,1)  to [resistor={info={$R$},ohm'=3}]  (2,1);
\draw (2,1)  to [voltage source ={direction info={volt=10}}] (2,0);
\draw (2,0)  to [resistor={info=$R$}] (0,0);
\node at (1,1/2) [circular annotation] {$I_1$};
\end{tikzpicture}
\end{document}