There is an urgent need to find renewable sources of energy that can replace fossil fuels in the next 100-200 years. Many think that hydrogen is the fuel of the future. It is abundant and nonpolluting. However, it is difficult to harness as it occurs in the combined state in nature. Also, it is exposing, so it is difficult to store. Efforts are on to make hydrogen an economically viable source of energy.
To do work needs energy. Energy is the ability to do work. Energy is needed for every thing you do- all living things need energy to live. Energy can be changed from one form to another. We use different forms of energy in our daily life.
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Sun releases energy. In the sky, Planets are run by energy. The nine planets, along with their satellite, encircle the sun and make up the solar system.
The atom and the hot interior of the earth are two other important sources.
Directly and indirectly, most of your energy comes from the sun. Green plants trap the sun’s energy to make food. Man and other animals eat food and use this energy to do work and to stay alive.
You see a solar cooker or a soar heater. Their source of energy is the sun. The energy that we get from the sun is called solar energy. This solar energy is into heat energy, fan turns, light energy, electrical energy and muscular energy. Fuels like coal, oil and wood stored solar energy. They give off heat and light energy when they are burnt.
An atom is his smallest particle of matter. Atomic energy comes from the splitting of an atom. Atomic energy should be used for peaceful purposes like making electricity. However, weapons like atom bombs, which can kill lakhs, have also been made and used.
The hot interior of the earth is another important source of energy. This is called geothermal energy. Scientists are working on how best to make use of this energy. Energy from natural sources like the sun though limitless, should not be wasted.
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More than 80% of the domestic fuel need of rural India is met by biomass. Wood, dry leaves and twigs, agricultural waste and cakes of cattle dung are biomass fuel. Burning biomass fuel directly in open chullahs wastes energy and causes indoor pollution. A better way to utilize biomass is to convert it into biogas. In a biogas plant, bacteria act upon biodegradable waste to produce a combustible gas, which is mostly ethane. The slushy residue