% ---------------------------------------------------------------
% Circuito RLC:  u(t) em paralelo com C  e  com o ramo série L–R
%   C dvC/dt = u - iL ;  L diL/dt = vC - R iL ;  y = vR = R iL
% Bibliotecas (carregadas no chunk .qmd):
%   arrows.meta, positioning, calc, decorations.pathmorphing
% ---------------------------------------------------------------
\begin{tikzpicture}[>=Latex, line width=1pt]

  % --- Trilhos ---
  \draw (0,0) -- (6,0);
  \draw (0,3) -- (6,3);

  % --- Fonte u(t) ---
  \draw (0,0) -- (0,1.1);
  \draw (0,1.9) -- (0,3);
  \draw (0,1.5) circle (0.4);
  \draw (-0.18,1.5) -- (0.18,1.5);
  \draw (0,1.32) -- (0,1.68);
  \node[left] at (-0.55,1.5) {$u(t)$};

  % --- Capacitor C (ramo central) ---
  \draw (2,3) -- (2,1.75);
  \draw[line width=1.3pt] (1.65,1.75) -- (2.35,1.75);
  \draw[line width=1.3pt] (1.65,1.45) -- (2.35,1.45);
  \draw (2,1.45) -- (2,0);
  \node[right] at (2.4,1.6) {$C$};
  \node[left]  at (1.55,2.35) {$v_C$};

  % --- Ramo série L–R (direita) ---
  % Indutor L
  \draw (4,3) -- (4,2.5);
  \draw[decorate, decoration={coil, aspect=0.55, segment length=5.5pt, amplitude=4.5pt}]
        (4,2.5) -- (4,1.7);
  \node[right] at (4.35,2.1) {$L$};
  % Resistor R (zig-zag)
  \draw (4,1.7) -- (4,1.45)
        -- (3.74,1.32) -- (4.26,1.12) -- (3.74,0.92) -- (4.26,0.72) -- (4,0.59)
        -- (4,0);
  \node[right] at (4.4,1.0) {$R$};

  % --- Corrente iL ---
  \draw[->] (4.0,2.95) -- (4.0,2.7);
  \node[right, font=\small] at (3.55,3.25) {$i_L$};

  % --- Saída y = vR ---
  \draw[->, blue!60!black] (5.1,1.55) -- (5.1,0.05);
  \node[right, blue!60!black] at (5.15,0.8) {$y = v_R$};

  % --- Nós ---
  \fill (2,3) circle (1.6pt);
  \fill (4,3) circle (1.6pt);
  \fill (2,0) circle (1.6pt);
  \fill (4,0) circle (1.6pt);

\end{tikzpicture}