Energy is the physical quantity which can use as
mechanical work, as heat and many other works.
Energy and the environment pose major scientific
and technological challenges in new century (21th
Types of energy
Renewable energy resource:- its means we can use
the resources again and again. Examples-
hydropower, wind, solar and biomass.
Non renewable energy resource:- these energy
resources are available in limited quantity and we can
not use then again and again.
Example- coal, oil and natural gas, thermal power and
commercial energy use by different sources
for the world in 2003
Hydro power:-Water energy is the most used
conventional renewable source of energy. Energy is
obtained from water flow, water falling from a
height. Hilly and high land areas are suitable for
this propose .
Wind energy:- wind power harnesses the energy
of the wind to propel the blondes of the wind to
propel the blades of wind turbines. These turbines
cause the rotation of magnets, which create
Solar energy:- solar energy is renewable resource of
energy, but it is very expensive to produce. we convert
sun light into electricity by using solar cells.
Bio-energy (Biomass):-bio-mass is all plant material
or vegetation cultivated.
Non-Renewable energy resource
Coal:- Coal, besides a prime source of industrial energy is
also a raw material.
Oil and Natural gas :- sedimentary rocks containing plant
and animal remains about 10-20 hundred year old are the
source of oil and natural gas.
Thermal power :- thermal power plants use
coal, petroleum and natural gas to produce thermal
Nuclear energy:- nuclear power stations are use nuclear
fission to generate energy from the reaction of Uranium
How can we save energy?
Use a solar cooker, say , for rice and dal. It saves gas.
Build houses following the principles of ecological
Car pooling .
Minimize the use of automobiles for local work like
Live near your place of study or work, if possible.
Use public transport whenever possible.
Almost all source of energy have their limits and
We must use the most sustainable high efficiency.
Substitute non-renewable energy by renewable
Use of a non-renewable resources creates
environment inputs when mining.
Introduction environment science ,BS publications
,edition2010 ,5th reprint , Y Anjaneyulu , Energy
resources , p-136-207
Ecology and Environment ,11th edition , Rastogi
publication , P. D. Sharma , Energy Crisis and nonConventional sources , p-551-584.
Environment studies from crisis to cure, second
edition ,Oxford university press, R. Rajagopalan
, Energy resources , p-119-131.