Explain the energy transformation of sun's radiation.

The sun's heat energy is the result of atomic and chemical energy changes in its interior and on its surface respectively. A part of the energy of radiation from the sun, travelling through space with the velocity of 3 ´ 10⁸ m/s, is used up in heating the dry land and the air which in turn causes winds and storms. A part of energy is also used to heat and evaporate water vapour from the oceans. Most of this energy is utilized when water condenses to clouds, which produce rains. At high altitudes, snow is deposited and this mass of water has huge potential energy. On its way to the sea, this potential energy of the water gets converted into kinetic energy and can thus be transformed into electrical energy at hydroelectric plants.