What are primary,secondary and supplementary sources of energy?
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A primary source of energy is one that occurs naturally. Fossil fuels (coal, oil and gas), biofuels, wind, waves, solar radiation and nuclear fuels are all primary sources of energy. A secondary energy source is one that is made using a primary resource.
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Fossil fuels (coal, oil and gas), biofuels, wind, waves, solar radiation and nuclear fuels are all primary sources of energy. A secondary energy source is one that is made using a primary resource. Electricity is secondary resource, and can be generated by a number of different primary sources.
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