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Temperature difference and electricity?

psynapse
in The Lounge

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I am unsure where to place this. But here I go anyway with a question.

How does the radioisotope thermoelectric generator use temperature difference to produce electricity? I read up on wikipedia but became more confused, things like phonons?? I can't visualize how the electrons would move. I was thinking about thermodynamic equalibrium ad the hot electrons flowing to the colder ones or even an electron density difference but I know I am missing something. Any help appreciated.

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