Adding a plus sign in a circuit diagram [duplicate]

Question

I would like to place a plus sign above my voltage source in circuitikz but I just can't figure out how to do it. Any ideas?

\documentclass{article}
\usepackage[free-standing-units]{siunitx}
\usepackage{circuitikz}

\begin{document}

\begin{circuitikz}
draw (0,0)  to [vsourcesin]  (0,2)
;

\end{circuitikz}

\end{document}

This is the solution:

\documentclass{article}
\usepackage{circuitikz}

\begin{document}
\begin{circuitikz}
\draw (0,0)
to[vsourcesin,i=$i$] (0,4);
\draw (-0.3,2.6) node{$+$};

\end{circuitikz}
\end{document}

Answer 1

If you don't want to use absolute coordinates, you can use the name=... option to specify a node name, Note, the anchors n,e,w,s etc. are assigned before the component is rotated.

\documentclass{standalone}
\usepackage{circuitikz}

\begin{document}

\begin{circuitikz}
\draw (0,0)  to[vsourcesin,name=VS]  (0,2);
\node[above left,inner sep=0pt] at (VS.e) {\tiny $+$};
\end{circuitikz}

\end{document}

---

From the source code I see the list of anchors include left, right, above, below, a and b, but they are still rotated like ne and sw. Other anchors like in, out, up and down are component dependent.

Answer 2

Your question is on one hand unclear and in a sense of electrical engineering wrong and in another it is duplicate to question as mentioned Steven S. Seglets in his comment. Anyway, see if this solution is satisfactory to you:

\documentclass{article}
\usepackage{siunitx}
\usepackage[siunitx]{circuitikz}

\usepackage[active,tightpage]{preview}
    \PreviewEnvironment{circuitikz}
    \setlength\PreviewBorder{1em}

\begin{document}
    \begin{circuitikz}[american]
\draw   (1,0) -- 
        (0,0) to [V, v=$V$, i=$i$]  (0,3)
              -- (1,3);
\draw   (4,0) --
        (3,0) to [V]  (3,3)
              -- (4,3);
    \end{circuitikz}
\end{document}