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[Phys-l] Which one is positive?



Suppose you have a low voltage dc power supply whose terminals look alike. How to find out which one is positive? Here is one suggestion, made by chemist.

"A good test for the proper connection is to use a silver wire anode and a platinum wire cathode in a sodium chloride solution. When current is passed, you should see an insoluble white precipitate of AgCl forming at the silver anode. If you don't see this, then your cell is connected backwards."

I did not know this.


Ludwik

http://csam.montclair.edu/~kowalski/life/intro.html