\documentclass[tikz, margin=15px]{standalone}
\usepackage{color,graphicx,circuitikz}
\usepackage[load-configurations=version-1]{siunitx}
\usetikzlibrary{arrows}
\begin{document}
 
\begin{circuitikz}[american, very thick]
\draw
        (0,10) to [I, l=\huge{$I_\textrm{s}$}] (4,10)
        to [R, l=\huge{$R_3$}] (8,10) 
        to (8,7) to [L, l=\huge{$sL$}] (8,4)
        to (0,4)
        to [V, l=\huge{$V_\textrm{s}$}] (0,7) to (0,10)
        (0,7) to [R, l=\huge{$R_1$}](4,7) to [R, l=\huge{$R_2$}](8,7)
        (4,7) to [C, l=\huge{$\frac{1}{sC}$}](4,4)
        {(4,8.5) node {\huge{\color{red}{1}}} (2,5.5) node {\huge{\color{red}{2}}} (6,5.5) node {\huge{\color{red}{3}}}};

;\end{circuitikz}
 
\end{document}