Wet van ohm wiel, makkelijk voor documentatie in Latex (TeX-macrotaal)

\documentclass[border=8mm]{standalone}
\usepackage{tikz}
\usepackage{amsmath}
\usepackage{xcolor} % veilig voor kleuren

\newcommand{\ohmslawcircleextended}{%
\begin{tikzpicture}[scale=3, font=\sffamily\scriptsize]

% Colors
\definecolor{lightpink}{RGB}{255,192,203}
\definecolor{lightpurple}{RGB}{200,162,200}
\definecolor{lightyellow}{RGB}{255,250,205}
\definecolor{lightorange}{RGB}{255,200,150}
\definecolor{lightgreen}{RGB}{152,251,152}
\definecolor{darkgreen}{RGB}{60,179,113}
\definecolor{lightblue}{RGB}{173,216,230}
\definecolor{lightlavender}{RGB}{200,180,230}

% Radii
\def\Rin{1}
\def\Rout{1.5}
\def\Rlabel{1.25}

% Extra outer ring (unit/prefix blocks)
\def\RinOuter{1.5}
\defRoutOuter{2.25}
\def\RlabelOuter{1.87}

% Styles
\tikzset{
  formula/.style={draw=none, fill=none, align=center, anchor=center, inner sep=1pt},
  ublock/.style={draw=none, fill=none, align=center, anchor=center, inner sep=1pt,
                 font=\sffamily\tiny, text width=2.2cm}
}

% OUTER RING (12 blocks)
\foreach \a/\b/\txt in {
  120/150/{A=A\cdot\Omega\\ mA=mA\cdot\Omega\\ A=mA\cdot k\Omega},
  150/180/{A=\dfrac{W}{A}\\ mA=\dfrac{mW}{A}\\ A=\dfrac{mW}{mA}},
  90/120/{A=\sqrt{W\cdot\Omega}\\ A=\sqrt{mW\cdot k\Omega}\\ mA=\sqrt{\mu W\cdot\Omega}},
  60/90/{V=\dfrac{V}{\Omega}\\ mV=\dfrac{mV}{\Omega}\\ \mu V=\dfrac{V}{M\Omega}},
  30/60/{V=\dfrac{W}{V}\\ mV=\dfrac{mW}{V}\\ V=\dfrac{mW}{mV}},
  0/30/{V=\sqrt{\dfrac{W}{\Omega}}\\ mV=\sqrt{\dfrac{mW}{k\Omega}}\\ \mu V=\sqrt{\dfrac{\mu W}{M\Omega}}},
  330/360/{\Omega=\dfrac{V}{A}\\ k\Omega=\dfrac{V}{mA}\\ M\Omega=\dfrac{V}{\mu A}},
  300/330/{\Omega=\dfrac{V^{2}}{W}\\ k\Omega=\dfrac{V^{2}}{mW}\\ M\Omega=\dfrac{V^{2}}{\mu W}},
  270/300/{\Omega=\dfrac{W}{A^{2}}\\ k\Omega=\dfrac{mW}{mA^{2}}\\ M\Omega=\dfrac{\mu W}{\mu A^{2}}},
  180/210/{W=V\cdot A\\ mW=V\cdot mA\\ \mu W=mV\cdot mA},
  210/240/{W=A^{2}\cdot\Omega\\ mW=mA^{2}\cdot k\Omega\\ \mu W=\mu A^{2}\cdot M\Omega},
  240/270/{W=\dfrac{V^{2}}{\Omega}\\ mW=\dfrac{V^{2}}{k\Omega}\\ \mu W=\dfrac{V^{2}}{M\Omega}}
}{
  \fill[white] (\a:\RinOuter) -- (\a:RoutOuter) arc (\a:\b:RoutOuter) -- (\b:\RinOuter) arc (\b:\a:\RinOuter) -- cycle;
  % FIX: multiline math -> gathered
  \node[ublock] at ({(\a+\b)/2}:\RlabelOuter) {$\begin{gathered}\txt\end{gathered}$};
}

\foreach \angle in {0,30,60,90,120,150,180,210,240,270,300,330} {
  \draw[black!35, line width=0.9pt] (\angle:\RinOuter) -- (\angle:RoutOuter);
}
\draw[black!35, line width=0.9pt] (0,0) circle (\RinOuter);
\draw[black!35, line width=0.9pt] (0,0) circle (RoutOuter);

% MIDDLE RING
\fill[lightpink] (120:\Rin) -- (120:\Rout) arc (120:150:\Rout) -- (150:\Rin) arc (150:120:\Rin) -- cycle;
\node[formula] at (135:\Rlabel) {$I=\dfrac{U}{R}$};

\fill[lightpink] (150:\Rin) -- (150:\Rout) arc (150:180:\Rout) -- (180:\Rin) arc (180:150:\Rin) -- cycle;
\node[formula] at (165:\Rlabel) {$I=\dfrac{P}{U}$};

\fill[lightpink] (90:\Rin) -- (90:\Rout) arc (90:120:\Rout) -- (120:\Rin) arc (120:90:\Rin) -- cycle;
\node[formula] at (105:\Rlabel) {$I=\sqrt{\dfrac{P}{R}}$};

\fill[lightyellow] (60:\Rin) -- (60:\Rout) arc (60:90:\Rout) -- (90:\Rin) arc (90:60:\Rin) -- cycle;
\node[formula] at (75:\Rlabel) {$U=\sqrt{P\cdot R}$};

\fill[lightyellow] (30:\Rin) -- (30:\Rout) arc (30:60:\Rout) -- (60:\Rin) arc (60:30:\Rin) -- cycle;
\node[formula] at (45:\Rlabel) {$U=\dfrac{P}{I}$};

\fill[lightorange] (0:\Rin) -- (0:\Rout) arc (0:30:\Rout) -- (30:\Rin) arc (30:0:\Rin) -- cycle;
\node[formula] at (15:\Rlabel) {$U=I\cdot R$};

\fill[lightlavender] (330:\Rin) -- (330:\Rout) arc (330:360:\Rout) -- (360:\Rin) arc (360:330:\Rin) -- cycle;
\node[formula] at (345:\Rlabel) {$R=\dfrac{U}{I}$};

\fill[lightlavender] (300:\Rin) -- (300:\Rout) arc (300:330:\Rout) -- (330:\Rin) arc (330:300:\Rin) -- cycle;
\node[formula] at (315:\Rlabel) {$R=\dfrac{U^{2}}{P}$};

\fill[lightlavender] (270:\Rin) -- (270:\Rout) arc (270:300:\Rout) -- (300:\Rin) arc (300:270:\Rin) -- cycle;
\node[formula] at (285:\Rlabel) {$R=\dfrac{P}{I^{2}}$};

\fill[lightgreen] (180:\Rin) -- (180:\Rout) arc (180:210:\Rout) -- (210:\Rin) arc (210:180:\Rin) -- cycle;
\node[formula] at (195:\Rlabel) {$P=U\cdot I$};

\fill[lightgreen] (210:\Rin) -- (210:\Rout) arc (210:240:\Rout) -- (240:\Rin) arc (240:210:\Rin) -- cycle;
\node[formula] at (225:\Rlabel) {$P=I^{2}\cdot R$};

\fill[lightgreen] (240:\Rin) -- (240:\Rout) arc (240:270:\Rout) -- (270:\Rin) arc (270:240:\Rin) -- cycle;
\node[formula] at (255:\Rlabel) {$P=\dfrac{U^{2}}{R}$};

\foreach \angle in {0,30,60,90,120,150,180,210,240,270,300,330} {
  \draw[white, line width=1.5pt] (\angle:\Rin) -- (\angle:\Rout);
}
\draw[white, line width=1.5pt] (0,0) circle (\Rin);
\draw[white, line width=1.5pt] (0,0) circle (\Rout);

% INNER QUADRANTS (no boxes)
\fill[lightpurple] (90:0) -- (90:1) arc (90:180:1) -- (180:0) -- cycle;
\node[draw=none, fill=none, font=\sffamily\Large\bfseries] at (135:0.55) {I};


\fill[darkgreen] (180:0) -- (180:1) arc (180:270:1) -- (270:0) -- cycle;
\node[draw=none, fill=none, font=\sffamily\Large\bfseries] at (225:0.55) {P};

\fill[lightblue] (270:0) -- (270:1) arc (270:360:1) -- (360:0) -- cycle;
\node[draw=none, fill=none, font=\sffamily\Large\bfseries] at (315:0.55) {R};

\fill[lightorange] (0:0) -- (0:1) arc (0:90:1) -- (90:0) -- cycle;
\node[draw=none, fill=none, font=\sffamily\Large\bfseries] at (45:0.55) {U};

\end{tikzpicture}%
}

\begin{document}
\ohmslawcircleextended
\end{document}