Most of machines to make electricity are the same in that they heat water to spin a turbine. The usual difference is how you heat the water.
Nuclear energy does this by fission. An extremely simplifies versjon of what goes on is you put radioactive materials next to each other and they interact by particles hitting each other. This happens so much that it causes plenty of heat. Imagine clapping your hands over and over Your hands gets hot the more you do this. The heat boils the water and the rest you know.
Now let’s change this slightly and instead of clapping it’s two cars crashing. This would cause bits to fly off of the cars. Those bits can be thought of as the parts of the atoms hitting each other can be thought of as the radiation. And just like the radiation, if you stand too close, then the bits can become harmful to you.
Hope that makes sense.
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