Does this actually work?!
Well yes it does! - I found a small piece of potato from the kitchen waste bin, and poked two stiff copper wires into it. The chapter in the book was talking about lead-acid battery chargers, so I applied 12 Volts from the bench power supply and very quickly heard a fizzing sound and saw a halo of green appear around the positive connection. Looking more closely at the the negative wire I could see small bubbles appearing. I assume the green colour is some kind of electro-chemical reaction taking place with the liquid in the potato to form a green copper compound.
As for a "quick and useful" method of testing polarity ... I think I will stick to the test meter for now.
73
Hugh
Great article with clear insights and practical value. The content is well organised, easy to understand, and helpful for readers looking to learn more about the topic. I really appreciate the useful points, smooth explanation, and professional writing style shared throughout this post.
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Panasonic 12V Lead Acid Battery