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RE: The Seebeck Effect: How to generate electricity from heat using two coins
Interesting post, will have to try this. However, our - Australian - coins are all mostly Cu, with the $1 and $2 coins being 95% Cu and the smaller denominations being 75% Cu / 25% Ni. Not sure how much of an effect will be visible?
In order to see the effect, the external coating on the two coins needs to be different. If the partial nickel coin has the nickel on the outside then you are good to go. I think that one coin being solid copper and one being solid nickel would help, but all you need to observe the effect is two different coated coins. Best of luck if you try it out!