Eli5: How do electrical generators work on an atomic level?

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As I understand it electricity is the flow of delocalised electrons, so where do they come from in the first place?

In: Chemistry

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Magnets in motion are capable of herding electrons through specific materials arranged in a specific way. Herding the electrons creates a potential difference, like lifting a heavy ball above your head. The faster/stronger the magnet is, the higher/heavier the ball. A generator then stores the energy and lets electrical devices “drop the heavy ball” to perform work.

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