resistors_series_circuit.tex

\documentclass{article}

\usepackage{tikz}
\usepackage[siunitx,americanvoltages]{circuitikz}

\usepackage{geometry}
\pagenumbering{gobble}

\begin{document}

\begin{center}
  \begin{tikzpicture}
    \begin{scope}
      \draw
      (0, -2) to [V^=$V_\mathrm{s}$,i_=$I$]
      (0, 2) to [R=$R_1$, v_=$V_{R_1}$]
      (3, 2) to [R=$R_2$, v_=$V_{R_2}$]
      (6, 2) to [R=$R_3$, v_=$V_{R_3}$]
      (6, -2) to (0, -2)
      ;
    \end{scope}
    \begin{scope}[yshift=-5cm]
      \draw
      (0, -2) to [V^=$\SI{10}{\volt}$,i_=$I$]
      (0, 2) to [R=$\SI{300}{\ohm}$, v_=$V_{R_1}$]
      (3, 2) to [R=$\SI{500}{\ohm}$, v_=$V_{R_2}$]
      (6, 2) to [R=$\SI{1200}{\ohm}$, v_=$V_{R_3}$]
      (6, -2) to (0, -2)
      ;
    \end{scope}
    \begin{scope}[yshift=-9cm]
      \draw
      (0, -1) to [V^=$\SI{10}{\volt}$,i_=$\SI{5}{\milli\ampere}$]
      (0, 1) to
      (2, 1) to [R=$\SI{1200}{\ohm}$]
      (2, -1) to (0, -1)
      ;
    \end{scope}
    \begin{scope}[yshift=-13cm]
      \draw
      (0, -2) to [V^=$\SI{10}{\volt}$,i_=$I$]
      (0, 2) to [R=$\SI{300}{\ohm}$, v_=$\SI{1.5}{\volt}$]
      (3, 2) to [R=$\SI{500}{\ohm}$, v_=$\SI{2.5}{\volt}$]
      (6, 2) to [R=$\SI{1200}{\ohm}$, v_=$\SI{6}{\volt}$]
      (6, -2) to (0, -2)
      ;
    \end{scope}
  \end{tikzpicture}
\end{center}

\end{document}