Seebeck Effect

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\documentclass{standalone}
\usepackage{circuitikz}
\usetikzlibrary{3d,positioning,decorations.markings}
\tikzset{
decoration={%
  markings,%
  mark=at position 0.05 with {\arrow[black]{stealth};},%
  mark=at position 0.4 with {\arrow[black]{stealth};},%
  mark=at position 0.6 with {\arrow[black]{stealth};},%
  mark=at position 0.95 with {\arrow[black]{stealth};}},
gradient/.style ={bottom color=blue!50, top color=red},
pics/.cd,
  p charge/.style={code={
      \node [fill=orange, shape=circle, inner sep=0pt] (pc) {+};
      \draw[thick,->] (pc)--++(0,-0.5);
  }},
  n charge/.style={code={
      \node [fill=cyan, shape=circle, inner sep=1pt, scale=1.2] (nc) {-};
      \draw[thick,->] (nc)--++(0,-0.5);
  }},
}
\newcommand\heatsink{
  \draw[fill=blue] (0,0,0) rectangle ++(6,1.5,0)node[midway,color=white]{heat sink};
  \draw[fill=blue] (6,0,0) -- ++(0,1.5,0) -- ++(0,0,-3) -- ++(0,-1.5,0) -- cycle;
  \draw[fill=blue] (0,1.5,0) -- ++(6,0,0) -- ++(0,0,-3) -- ++(-6,0,0) -- cycle;
  \draw[gradient,opacity=0.5] (0.5,1.5,-2.8) -- ++(0,10,0);
  \draw[gradient,opacity=0.5] (0.5,1.5,-2.8) -- ++(5,0,0);
}
\begin{document}
\begin{circuitikz}[scale=0.4,font=\sffamily,>=stealth]
  \begin{scope}
    % heat sink 1
    \heatsink
    \draw[gradient,opacity=0.5] (0.5,1.5,-2.8) -- ++(0,0,2.6);
    \fill[gradient,opacity=0.7] (5.5,1.5,-0.2) -- ++(0,10,0) -- ++(0,0,-2.6) -- ++(0,-10,0) -- cycle;
 
 
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