Nuclear energy:

               Nuclear energy is the energy released in the form of atomic radiation in addition to heat and light during nuclear reactions such as fission and fusion reactions. The heat energy released in nuclear reactors is converted into electrical energy.

Examples:

                The energy coming from the Sun for the last billions of years is the result of nuclear reactions taking place on the Sun.

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Our body gets energy stored in the food we take to perform various activities.

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A nuclear power plant uses the energy released in a nuclear reactor such as fission to generate electric power.