Diagram showing how nuclear fission works.
Nuclear energy is the energy inside the nucleus, or core, of an atom. Electricity can be extracted from nuclear energy, but it must first be released from the atom. A nuclear reactor transfers the heat from it into steam, which is put through turbines turning it into kinetic energy and then electricity.
Nuclear energy is located inside the nucleus or core of an atom. Atoms are tiny building blocks that make up all matter in the universe and energy is what holds the nucleus together which contains a large amount of energy.
It is a good energy source because it will not run out quickly and it outputs huge amounts of energy for a small amount of work.
There are multiple difficulties and problems with using this energy source. The main problem is that if it goes wrong it can cause a massive nuclear fallout which can make certain areas of the world uninhabitable and can cause cancer.