circuit-using-latex

Lesson-2: Basic Components

Draw a straight wire from (0,0) to (4,0):

Method-1:

\begin{circuitikz}
  \draw (0,0) -- (4,0);
\end{circuitikz}

🔍 Explanation:

• – → draws a plain wire

• (0,0) → starting point

• (4,0) → ending point

Method-2: (Recommended)

\begin{circuitikz}
  \draw (0,0) to[short] (4,0);
\end{circuitikz}

Output:

Junctions and Nodes

Simple Node (Connection Point):
Syntax:

\draw (2,0) node[circ] {};

Wire with a Node:
Syntax:

\draw (0,0) to[short] (2,0) node[circ] {} to[short] (4,0);

Example:

\documentclass{article}
\usepackage{circuitikz}

\begin{document}

\begin{center}
\begin{circuitikz}

    % Example 1: A simple wire with a junction (node) in the middle
    \draw (0,0) to[short] (2,0) node[circ] {} to[short] (4,0);

    % Example 2: A vertical wire branching down from the node
    \draw (2,0) to[short] (2,-2);

\end{circuitikz}
\end{center}

\end{document}

Output:

Draws a resistor horizontally from x=0 to x=3:

Syntax:

\begin{circuitikz}
    \draw (0,0) to[R, l=$R_1$] (3,0);
\end{circuitikz} 

Explanation:

• R: Specifies the component is a Resistor.
• l=$R_1$: Adds a label above the component. The $ signs are used for mathematical formatting (italics, subscripts).

Example:

\documentclass{article} % The type of document

% The Preamble
\usepackage{circuitikz} % We are importing the circuit tool

\begin{document}

    % The Drawing Area
    \begin{center}
        \begin{circuitikz}
            % This draws a wire from (0,0) to (2,0) with a Resistor in the middle
            \draw (0,0) to[R] (3,0); 
        \end{circuitikz}
    \end{center}

\end{document}

Output:

If you want to name the resistor:

\draw (0,0) to[R, l=$R_1$] (3,0);

---

The Vertical Resistor:

\begin{circuitikz}
  \draw (0,0) to[R, l=$R_{\rm load}$] (0,3);
\end{circuitikz}

Explanation:

• R_ → creates a subscript for R
• {\rm load} → typesets the subscript text in upright (roman) font instead of italic

Output:

🔹 Capacitor

Horizontal Capacitor:

\begin{circuitikz}
  \draw (0,0) to[C, l=$C_1$] (3,0);
\end{circuitikz}

Output:

Vertical Capacitor

\begin{circuitikz}
  \draw (0,0) to[C, l=$C_{\rm load}$] (0,3);
\end{circuitikz}

Output:

Horizontal Inductor

\begin{circuitikz}
  \draw (0,0) to[L, l=$L_1$] (3,0);
\end{circuitikz}

Output:

🔹 Voltage Sources

DC Voltage Source

\begin{circuitikz}
  \draw (0,0) to[V, l=10V] (0,3);
\end{circuitikz}

Output:

Battery

\begin{circuitikz}
  \draw (0,0) to[battery, l=9V] (0,3);
\end{circuitikz}

Output: