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There are other energy sources which are not so popular but are now gaining importance such as:-Hydrogen EnergyChemical Sources of Energy (Fuel Cells)Geo Thermal EnergyOcean  and Tidal EnergyBiofuelsAnimal Energy
Hydrogen Energy:-
In the case of Hydrogen energy, electricity is produced through an electro-chemical reaction between hydrogen and oxygen. Hydrogen can be produced from electrolysis of water using solar energy. It can be extracted from sewage gas, natural gas, naptha or biogas. Fuel cells can be very widely used  for a wide range of applications once they become commercially viable.
Hydrogen as Fuel:-
Hydrogen as a gas is so much lighter than air that it rises fast and is quikly ejected from atmosphere. It found only in compound which is water and is result of hydrogen combining with oxygen. Hydrogen when combined with carbon forms different compounds like methane, coal and petroleum. Hydrogen is also available in biomass. 

Point to Remember:
Hydrogen has the highest energy conten…
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WIND Energy

Wind is the natural movement of air across the land or sea. Wind is caused by uneven heating and cooling of the earth's surface and by the earth's rotation. Land and water areas absorb and release the different amount of heat received from the sun. As warm air rises, cooler air rushes in to take its place, causing local winds. The rotation of the earth changes the direction of the flow of air.

Wind is simple air in motion. It is caused by the uneven heating of the earth's surface by the sun. Since the earth's surface is made of very  different types of land and water, it absorbs the sun"s heat at different rates.

During the day, the air above the land heats up more quickly than the air over water. The warm air over the land expands and rises and the heavier, cooler air rushes in to take its place, creating winds. At night, the winds are reversed because the air cools more rapidly over land than over water.

Today, wind energy is mainly used to generate electricity…


Biomass is the organic matter in trees, agricultural crops  and other living plant material. It is made up of carbohydrates-organic compounds that are formed in growing plant life. Biomass is solar energy stored in organic matter.
As trees and plants grow, the process of photosynthesis uses energy from the sun to convert carbon dioxide into carbohydrates (sugars, starches and cellulose). Carbohydrates are organic compounds that make up biomass. When plants die, the process of decay releases the energy stored in carbohydrates and discharges carbon dioxide back into the atmosphere. Biomass is a renewable energy source because the growth of new plants and trees replenishes the supply.  
The biomass are generally termed for the following:- Land and water based vegetation Organic wastesPhotosynthetic organisms The primary step in the buildup of biomass is photosynthesis. In photosynthesis, sunlight is absorbed by chlorophyll in the chloroplasts of green plant cells and is utilized by the p…