Here’s a puzzle I just read in Clifford Stoll‘s book *High Tech Heretic* (paraphrased by me):

Consider 12 identical resistors connected to form a cube. That is, each resistor lies on the edge of a cube, and there is an electrical connection joining three resistors at each of the cube’s eight vertices.

What is the effective resistance between two vertices across a body diagonal of the cube?

I’ll update this post with my solution (you can probably find solutions all over the internet if you get stuck, but give it a good try if interested!) in a day or two.

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## About Santo D'Agostino

I have taught mathematics and physics since the mid 1980s. I have also been a textbook writer/editor since then. Currently I am working independently on a number of writing and education projects while teaching physics at my local university.
I love math and physics, and love teaching and writing about them. My blog also discusses education, science, environment, etc. https://qedinsight.wordpress.com
Further resources, and online tutoring, can be found at my other site
http://www.qedinfinity.com

Very interesting post about resistors. I will have to check back to see what the answer is.

Thanks, Peter! Some discussion and links to answers are now posted.

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