Describe nuclear energy and its practical application as an alternative energy source and its potential problems

Changes can occur in the structure of the nuclei of atoms. These changes are called nuclear reactions. Energy created in a nuclear reaction is called nuclear energy.

So nuclear energy is energy released by reactions within atomic nuclei, as in nuclear fission or fusion. An alternative energy source can be renewable energy. It is energy which is generated from natural sources (sun, wind, rain, tides) and can be generated again and again as and when required. It is good because to generated anything it can be used such as the wind to help generate energy etc. The potential problems is that what happens when there is no wind and sunlight? Then you will have no energy to generate things.