Nuclear energy appears as heat (after all, if it wasn't moderated it would explode). Now you have a heat source to drive steam turbines to deliver electricity, just like a coal-fired power station.
Most commonly through windmills. the wind pushes on a tilted blade causing it to rotate. A generator inside the windmill then truns the kinetic energy of the rotation into an electric current.
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You ingest the food that you eat and the vitamins that you swallow. Your stomach turns it into human energy and then it goes to all of your body parts by veins.