Perhaps.
In producing electricity
Nuclear energy is not useful in powering a flashlight because it is not readily convertible into electrical energy that can power the light bulb in a flashlight.
Electricity.
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Nuclear energy provides about 20 percent of US electricity, so it is useful. Atomic energy is the same thing, but is now an obsolete term, we use nuclear energy as the description now.
Those most at risk in a nuclear energy accident are the workers at the nuclear facility itself.
Uranium is one of the most common radioactive elements used in nuclear reactions. It undergoes nuclear fission, where its nucleus is split into smaller fragments, releasing energy in the process.
because its really useful
They produce electrical energy. Humans need a lot of that.
the most expensive is nuclear energy
Until converted, it is potential energy. However, to make nuclear energy domestically useful it is converted into thermal (thermodynamic) energy (heat), which, in turn, is converted into electrical energy, both of which are kinetic energy.