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The Wikipedia page for Joule heating explains


However, I wonder why they only talk about ions. Of course, electrons can easier interact with particles, which also have a long range field, but what about the non-charged particles which are also all around?

Is Joule heating only between electrons and ions?

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I guess they have metals in mind. For a solution (electrolyte) it is clearly not the case because each charged molecule (ion) is surrounded by neutral molecules (since most of the molecules are neutral) and in liquid molecules can't just fly through, they are in a constant collision.

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