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Re:“You don't have a voltmeter. Do you have a potato?” by userbinator on Friday November 25, 2022 @10:09AM (#33743027)
Written description: https://navyaviation.tpub.com/14329/Figure-6-52-One-Method-O...

...although I haven't found any explanation online why it works. This method has probably been known for over a century, so I suspect it may be in some old physics books.

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