Sources of Energy - Primary and Secondary

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Primary Energy

The source of energy which does not require any transformation before the use is called primary energy. They are directly used as they available in nature. E.g. sun, river water, mountain lakes, wind, coal, crude oil, natural gas, wood, uranium, geothermal heat etc. 

Secondary Energy

The source which requires transformation before the use is called secondary energy. E.g. Petrol, diesel, kerosene, charcoal, electricity etc. The petrol, diesel and kerosene are derived from the petroleum (crude oil), charcoal derived from the wood, electricity derived from the water, wind, coal and also from the sun.

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