The Sun as a Source of Energy
The Sun as a Source of Energy
·
What is solar energy? Energy
from sun is known Solar Energy. Solar
energy is the radiant energy produced by the Sun. This source of energy is
renewable. This source of energy is used world-wide by many people.
·
Solar energy is a very useful
form of energy like atomic and wind energy. About of the solar energy is light,
about half is infrared radiation (heat, energy, etc.in rays) and very little
ultraviolet radiation.
·
In modern times, the first
main use of solar energy is to change it into thermal energy (of heat as that of
coal or gas). Solar rays hit a flat 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.
·
Scientists have converted
(change) solar energy to electrical energy through solar cells. A solar cell is
an invention (device) that directly changes solar radiation to electrical
energy.
·
Heat engine are being used to
convert solar energy to mechanical energy. This mechanical energy is used directly
or again converted to electric energy for operating machines.
·
We can use the solar energy
or heat stored in the sea. Most of the solar energy that comes to the world is
taken by the sea. The water at the surface of the sea is warmer than at the
depth.
·
In Japan and some other
countries small plants grow in the sea by absorbing sunlight. These plants are
dried then used as food.
·
There have been attempts to
make solar cars in Europe and elsewhere. These cars run on electric energy instead
of oil. The cars batteries charged with solar energy provide the electric
energy. However, at present the batteries are too heavy and are charged over
long hours. Solar energy may be the answer to many of our energy problems.
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