How can I reduce the size of an electric circuit in Circuitikz?

Question

In fact, I have drawn an electric scheme using circuitikz package, but when I try to reduce the size of the circuit by using a scale of 0.5, the electric components stay in their size. Because I want to display two circuits one next to the other. Here is the code :

\documentclass{article}
\usepackage{tikz}
\usepackage[straightvoltages]{circuitikz}
\usetikzlibrary{arrows}
\begin{document}
\begin{circuitikz}[scale=1.2][american voltages]
\draw

 (0,0) to [open,v>=${v}_{ds}$] (0,4) 
  to [short, *- ,i=${i}_{ds}$] (0.5,4)
  to [R, l=$R_s$] (2,4) 
  to [L, l=$X_s$] (4,4)
  to [european voltage source, l_=${\omega}_s {\phi}_{qs}$] (4.5,4)
  (4.5,4) to [short, -] (5,4)
  (5,4) to [L, l_=$X_m$] (5,0)

  (5,4) to [european voltage source, l_=${\omega}_r {\phi}_{qr}$] (6.5,4)
  to [L, l=$X_r$] (7.5,4)
  to [R, l=$R_r$] (9.8,4)
  to [short, -* ,i<=${i}_{dr}$] (10,4) 
  (10,0) to [open, v>=${v}_{dr}$] (10,4)
  (0,0) to [short, *-*] (10,0);
  \end{circuitikz}
  \end{document}

And here is the change in the figure below:

Answer 1

see if this help:

\begin{circuitikz}[scale=0.5][american voltages]
\ctikzset{bipoles/length=.8cm}

addendum: however, i would redraw you image (on more consistent way, all in european style) as follows:

\documentclass{article}
\usepackage{tikz}
\usepackage[straightvoltages, european]{circuitikz}
\usetikzlibrary{arrows}

\begin{document}
    \begin{circuitikz}[ scale=0.5,          % i would rather scale 0.6, if possible
                        font=\footnotesize  % <-- smaller font
                        ]
\ctikzset{bipoles/length=7mm}               % <-- smaller bipole elements
%
\draw   (0,0)   to [open,v>=$v_{ds}$] (0,4)
                to [short, *- ,i=$i_{ds}$] (0.5,4)
                to [R, l=$R_s$] (2,4)
                to [L, l=$X_s$] (3.5,4)
                to [V, l_=$\omega_s \phi_{qs}$] (5,4)
        (5,4)   to [short] (5.5,4)

        (5.25,4)to [L, l_=$X_m$, *-*] (5.25,0)

        (5.5,4) to [V, l_=$\omega_r \phi_{qr}$] (7,4)
                to [L, l=$X_r$] (8.5,4)
                to [R, l=$R_r$] (10,4)
                to [short, -* ,i<=$i_{dr}$] (10.5,4)
                to [open, v^<=$v_{dr}$] (10.5,0)
        (0,0)   to [short, *-*] (10.5,0);
    \end{circuitikz}
\end{document}