Solar energy is a very useful from of energy like atomic and wind energy. The problem of rising costs of fuel like oil and gas and pullution dirtiness of the atmosphere caused by them have made scientists work on solar energy for man's future use. About half of the solar energy is is light, about half is infrared radiation heat energy etc in rays and very little ultraviolet radiation. In olden times in China Egypt the Middle East Greece and Italy solar energy was used to evaporate salt water change it into vapour to get salt Crop drying through solar heat was also common. In the 19th century. It was used for preparing wine in China south America. In the early 20th century it was used in Egypt to run an engine for punpimg irrigation water from the Nile.
Solar rays hit a flat place collector which absorbs a lot of heat. This flat plate collector is then used for water heating house heating air conditioning and for getting salt from salt water and pure drinking water from sea water. Solar water heaters use in Australia Japan and America in air conditioning the flat plate collector supplies heat to operate an air conditioner in solar evaporation salty water is made to everyprote form ponds and thus salt is obtained. In solar distillation pure water vapour is collected in storage tanks.
A solar cell is an invention device that directly changes solar radiation to electrice energy. Spaceship get their electric power from solar cells. Future, solar cells are being used to power supplies from them. At present, the cost of producing electricity from solar cells is very high. Energy is used directly or is again convert to electric energy for operating machines. Heat collectors are used to heat fluids whose steam passes through engines where it is converted to mechanical energy.
The water at the surface of the Sea is warmer than at the depth. Heat flows from the area of higher temperature to that of a lower one. So if we make this heat of the warm water flow through a heat engine the heat energy can be converted to maechanicel or electrical energy. Power plants are dired and then used as food
There have been attempts to make a solar cars in Europe Japan and elsewhere. These cars run on electric energy instead of oil. The cars batteries are to heavy and are charged over long hours.
Solar energy is important for us