如何在电路中实现白色或空箭头？

Question

我已经阅读了 circuitikz 文档，没有这样的符号（至少在文档中没有）可以与电路右上角的白色/空箭头（标记为电压 V0）相媲美。有办法吗？我不是在寻找电流箭头。

编辑：

这是电路代码。

\usepackage{circuitikz}
\begin{center}
\begin{circuitikz}[american]
\draw (2,0)--(0,0) node[ground]{} to[sV, v=\textit{vi=4Vpp}] (0,2) to[R, l=\textit{r}$_0$\textit{=50$\Omega$}](2,2) to[open] (2,0)--(5.5,0);
\draw (2,2) to[short, *-] (2,1.3) to[short] (2.75,1.3) to[short] (2.75,1.65) to[short, i=$ $] (2.75,2);
\draw (2,2) to[R, l^=$10K\Omega$] (3.5,2) to[short] (4,2);
\draw (3.5,2) -- (4.5,2) to[short, *-*] (5.5,2) to[short] (5.8,2) to[short, i=$ $] (6,2);
\draw (4.5,2) to[R, l_=$10K\Omega$] (4.5,0);
\draw (5.5,2) to[R, l=$5K\Omega$] (5.5,0);
\draw (4.25,1.6) -- (4.25,2.2) to[short] (4.3,2.2) to[short, i=$Z_A$] (4.5,2.2);
\draw (4,2) to[short, -o] (4,2.3);
\draw (4.4,2.5)to[open, l=$A$] (4.4,2.7);
\end{circuitikz}
\captionof{figure}{\small Impedance circuit.}
\end{center}

Answer 1

解决方法：

\documentclass{article}
\usepackage{circuitikz,caption}
\begin{document}
\begin{center}
\begin{circuitikz}[american]
\draw (2,0)--(0,0) node[ground]{} to[sV, v=\textit{vi=4Vpp}] (0,2) to[R, l=\textit{r}$_0$\textit{=50$\Omega$}](2,2) to[open] (2,0)--(5.5,0);
\draw (2,2) to[short, *-] (2,1.3) to[short] (2.75,1.3) to[short] (2.75,1.65) to[short, i=$ $] (2.75,2);
\draw (2,2) to[R, l^=$10K\Omega$] (3.5,2) to[short] (4,2);
\draw (3.5,2) -- (4.5,2) to[short, *-*] (5.5,2) to[short] (5.8,2);% to[short, i=$$] (6,2);
 \draw[-open triangle 45] (5.8,2)--(7,2)node[right] {V0};
\draw (4.5,2) to[R, l_=$10K\Omega$] (4.5,0);
\draw (5.5,2) to[R, l=$5K\Omega$] (5.5,0);
\draw (4.25,1.6) -- (4.25,2.2) to[short] (4.3,2.2) to[short, i=$Z_A$] (4.5,2.2);
\draw (4,2) to[short, -o] (4,2.3);
\draw (4.4,2.5)to[open, l=$A$] (4.4,2.7);
\end{circuitikz}
\captionof{figure}{\small Impedance circuit.}
\end{center}
\end{document}