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Circuit diagram used by w:Analysis of resistive circuits.

David Benbennick made it with the following crappy Metapost program:

verbatimtex
%&latex
\documentclass{article}
\begin{document}
etex

scale=0.8in;
linethickness=1pt;

def docircuit =
  path pp;
  pp = unitsquare scaled scale shifted (-scale/2,-scale/2);
  draw pp;
  fill pp withcolor thecolor;

  linecap:=butt; draw (-7/6scale, 1/3scale) -- (-1/2scale, 1/3scale);
  linecap:=butt; draw (-7/6scale, -1/3scale) -- (-1/2scale, -1/3scale);

  draw thelabel(btex $+$ etex, (-7/6scale, 1.2/6scale));
  draw thelabel(btex $-$ etex, (-7/6scale, -1.2/6scale));

  linecap:=rounded;
  drawarrow (-7/6scale + 1/8scale, 0.8*1/3scale) --
    (-1/2scale - 1/8scale, 0.8*1/3scale)
    withcolor blue;

  if num = 1 :
    draw thelabel(btex \sf Circuit 1 etex, (0,0));
    dotlabel.lft(btex a etex, (-7/6scale, 1/3scale));
    dotlabel.lft(btex b etex, (-7/6scale, -1/3scale));
    draw thelabel(btex \sf V$_1$ etex, (-0.97*7/6scale, -0.02*scale));
    draw thelabel(btex \sf I$_1$ etex, (-5/6scale, 0.4*1/3scale));
  else :
    draw thelabel(btex \sf Circuit 2 etex, (0,0));
    dotlabel.lft(btex x etex, (-7/6scale, 1/3scale));
    dotlabel.lft(btex y etex, (-7/6scale, -1/3scale));
    draw thelabel(btex \sf V$_2$ etex, (-0.97*7/6scale, -0.02*scale));
    draw thelabel(btex \sf I$_2$ etex, (-5/6scale, 0.4*1/3scale));
  fi;
enddef;

beginfig(1);
  pickup pencircle scaled linethickness;

  color thecolor;

  thecolor = (0.8,1,1);
  num := 1;
  docircuit;

  currentpicture := currentpicture shifted (0, 1.3*scale);

  thecolor := (1,1,0.8);
  num := 2;
  docircuit;

  currentpicture := currentpicture shifted (10cm,5cm);
endfig;
end;

I saved the above as Circuit_equivalence.mp, and the TeX program below as Circuit_equivalence.tex:

&latex
\documentclass[10pt]{article}
 \usepackage{graphicx}
\pagestyle{empty}
\begin{document}
 \includegraphics{Circuit_equivalence.1}
\end{document}

Then I ran

mpost Circuit_equivalence
tex Circuit_equivalence
dvips -mode ljfzzz -D 1200 Circuit_equivalence -o
convert -density 1200 Circuit_equivalence.ps Circuit_equivalence.pnm
pnmcrop Circuit_equivalence.pnm | pnmtopng > a.png
pngrewrite a.png Circuit_equivalence.png
optipng Circuit_equivalence.png

I, the copyright holder of this work, hereby publish it under the following licenses:

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

	This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
	You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
	This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue

This file is licensed under the Creative Commons Attribution-Share Alike 2.5 Generic license.

You are free:

• to share – to copy, distribute and transmit the work
• to remix – to adapt the work

Under the following conditions:

• attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
• share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.

https://creativecommons.org/licenses/by-sa/2.5CC BY-SA 2.5 Creative Commons Attribution-Share Alike 2.5 truetrue

You may select the license of your choice.