Example: Phasor diagram

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%& -shell-escape
% Phasor diagram
% Author: Urs Zellweger (urs@zellweger.li)
% GNUPLOT required
\documentclass[11pt]{article}
\usepackage{ifthen}
\usepackage{tikz}
\usepackage{pgf}
\usepackage{pgffor}
\usepgfmodule{shapes}
\usepgfmodule{plot}
\usetikzlibrary{decorations}
\usetikzlibrary{arrows}
\usetikzlibrary{snakes}
\newcommand{\Gitter}[4]{
    \draw[very thin,color=gray] (#1,#3) grid (#2,#4);
}
\newcommand{\Koordinatenkreuz}[6]{
    \draw[->, >=latex, color=green!50!black] (#1,0) -- (#2,0) node[right] {#5};
    \draw[->, >=latex, color=green!50!black] (0,#3) -- (0,#4) node[left] {#6};
}
\newcommand{\KoordinatenkreuzOhneLabelsVerschobenKeinPfeil}[5]{
    \draw[-] (#1,0) -- (#2,0);
    \draw[-] (#5,#3) -- (#5,#4);
}
\newcommand{\ZeigerdiagrammText}[4]{
\begin{tikzpicture}[scale=.72, samples=100, >=latex]
    \def\Alpha{#1}
    \def\Phase{#2}
    \def\AmplitudeSpannung{#3}
    \def\AmplitudeStrom{#4}
    \def\SpannungsWert{{\AmplitudeSpannung*sin(\Alpha)}}
    \def\StromWert{{\AmplitudeStrom*sin(\Alpha+\Phase)}}
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    \def\FarbeSpannung{blue!90!white}
    \def\FarbeStrom{red!90!white}
    \def\FarbeWinkelZeichnung{green}
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    \def\Beta{\Alpha+\Phase}
    \def\AlphaRad{\Alpha*3.141592654/180}
    \def\PhaseRad{\Phase*3.141592654/180}
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    \Gitter{-.1}{7.1}{-3.1}{3.1}
    \Koordinatenkreuz{-.2}{7.3}{-3.2}{3.3}{$\omega t$}{}
    \draw (1.570795,0) node[below]{$\frac{\pi}{2}$};
    \draw (3.14159,0) node[below]{${\pi}$};
    \draw (4.71238898,0) node[below]{$\frac{3\pi}{2}$};
    \draw (6.283185307,0) node[below]{${2\pi}$};
    \draw (-4,0) circle (3cm);
    \KoordinatenkreuzOhneLabelsVerschobenKeinPfeil{-7.2}{-.8}{-3.6}{3.6}{-4}
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    % voltage
    \draw[color=\FarbeSpannung, very thick] plot[id=voltage, domain=0:7] function{\AmplitudeSpannung*sin(x)} node[right] {$U(t)$};
    % voltage circle
    \draw[color=\FarbeSpannung, loosely dashed] (-4,0) circle (\AmplitudeSpannung cm);
    % angle
    \draw[color=\FarbeWinkelZeichnung!50!black, thick] (\AlphaRad, \SpannungsWert)--(\AlphaRad,\StromWert) node[below=18pt] {$\alpha$};
    % angle in the circle
    \filldraw[fill=\FarbeWinkelZeichnung!20,draw=\FarbeWinkelZeichnung!50!black] (-4,0) -- (-3,0) arc (0:\Alpha:1) -- cycle node[right] {$\alpha$};
    % voltage pointer
    \draw[<-,color=\FarbeSpannung, very thick] (\Alpha:\AmplitudeSpannung)++(-4,0) --(-4,0);
    \draw[color=\FarbeSpannung,  dashed] (\Alpha:\AmplitudeSpannung)++(-4,0) -- (\AlphaRad,\SpannungsWert);
    % current
    \draw[color=\FarbeStrom, very thick] plot[id=current, domain=0:7] function{\AmplitudeStrom*sin(x+\PhaseRad)} node[right] {$I(t)$};      
    % current circle
    \draw[color=\FarbeStrom, loosely dashed]    (-4,0) circle (\AmplitudeStrom cm);
    % current pointer
    \draw[<-,color=\FarbeStrom, very thick] (\Beta:\AmplitudeStrom)++(-4,0) --(-4,0);
    \draw[color=\FarbeStrom,  dashed](\Beta:\AmplitudeStrom)++(-4,0) -- (\AlphaRad,\StromWert);
    % phase difference
    \ifthenelse{\Phase<0}{
        \draw[snake=brace] (pi/2 ,3.3)--(pi/2-\PhaseRad ,3.3) node[above=7pt, left=10pt] {$\phi$};
    }
    {
        \draw[snake=brace] (pi/2-\PhaseRad ,3.3)--(pi/2 ,3.3) node[above=7pt, left=10pt] {$\phi$};
    }
    % angular velocity \omega
    \draw[->, xshift=-4cm]  (120:2.4cm) arc (120:170:2) node[below] {$\omega$};
\end{tikzpicture}
}
% % % % % % % % % % % % % % % % % % % % % % % % % % %
\begin{document}
% usage: {alpha}{phasedifferenceUI}{voltage}{current}{Ualpha}{Ialpha}
% resistor
\ZeigerdiagrammText{60}{0}{2.7}{1.8}
% inductivity / coil
\ZeigerdiagrammText{60}{-90}{2.7}{1.8}
% capacity / conductor
\ZeigerdiagrammText{60}{90}{2.7}{1.8}
\end{document}