We will discuss here about the role and eco-friendly nature of solar energy.
Role of solar energy in nature:
(i) Green plants trap solar energy by photosynthesis and store it within the food. Animals get this energy along with their food from the green plants.
(ii) Solar energy generates wind and wave powers.
(iii) Water evaporates from seas, rivers, lakes and ponds due to heat of the Sun. This water vapor forms cloud, that results rainfall.
(iv) Sunlight kills millions of harmful germs.
Eco-friendly nature of solar energy:
(i) Green house cultivation: In Europe green house cultivation has become very popular. Green houses are built with transparent roofs. It allows the entry of solar heat and light, which are essential for the growth of plants.
(ii) Solar lighting: South facing houses with larger windows enjoy better lighting in the rooms. It saves electricity during day time.
(iii) Solar water heating: Solar water heaters provide hot water for domestic use. It is very popular in cold countries.
(iv) Solar electric cells: In solar cells light energy is converted into electrical energy. Various sizes of panels of solar cells are prepared to generate electricity as per need. These solar cells are used for power supply to calculators, mobile chargers, street lights and many other items. Very large solar panels are used for supply of electricity in space stations, space shuttles and satellites. These are almost maintenance free and suitable for use-in unmanned spacecrafts.
(v) Solar cooker: Special types of boxes, bowls or reflector sets are used to prepare solar cookers, which can retain solar heat. This heat is utilized for cooking food.
The largest solar reflector system of the world is situated near Abu Road, Rajasthan. It can retain huge heat to cook up to 35000 meals per day.
(vi) Solar vehicles: Engineers of different countries have developed vehicles, which run by solar energy. Solar cars, solar ferry boats and solar catamarans now on move successfully.