Sources of Energy

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We cannot depend on the fossil fuels for much longer. Fossil fuels will get depleted some day are said to be exhaustible sources or non-renewable sources of energy.

Non-renewable sources of energy are those which are exhaustible and cannot be replaced once they have been used. These sources have been accumulated in nature over a very long period of millions of years.

Examples of Non-renewable sources of Energy :(i) Coal (ii) Oil and (iii) Natural gas.

All these fuels are called fossil fuels.

Renewable energy is available in our natural environment. Renewable sources of energy are those which are inexhaustible, i.e., which can be replaced as we use them and can be used to produce energy again and again. These are available in an unlimited amount in nature and develop within a relatively short period of time.

Examples of Renewable Sources of Energy. Solar energy, Wind Energy, water energy (hydro-energy), geothermal energy, ocean energy, biomass energy (firewood, animal dung and biodegradable
waste from cities and crop residues constitute biomass).