What does it mean by primary, secondary, final and useful energy stage?
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Primary Energy
Primary energy is the energy as it is available as resources – such as the fuels that are burnt in power plants – before it has been transformed. This relates to the coal before it burned; the uranium; or the barrels of crude oil. This is the most widely available statistic and very commonly used PE.
Secondary Energy
When we convert primary energy into a transportable form we speak of secondary energy. For example, when we burn coal in a power plant to produce electricity, electricity is a form of secondary energy. Secondary energy like liquid fuels (gasoline, petrol and diesel: which are refined oil), electricity and heat.
Final Energy
Once we’ve transported secondary energy to the consumer it is final energy. Final energy is what a consumer buys and receives, such as electricity, heating, or petrol, diesel at the fuel pump.
Useful Energy
This is the last step. It is the energy that goes towards the desired output of the end-use application. For a lightbulb, it’s the amount of light that is produced, Fan, AC, fridge, collar use electricity to cool. For a car, it’s the amount of kinetic (movement) energy that is produced from oil.