2. Trends in energy demand
Primary energy corresponds to energy before transformation. This is the case, for example, with crude oil, coal or water from a dam. Secondary energy is obtained after transformation: gasoline or diesel from petroleum, charcoal from wood, electricity from natural gas, and so on. Final energy is that used by the consumer, such as electricity or heating oil. Finally, useful energy is that which is actually used for the required purpose.
with an electric drill powered by nuclear-generated electricity, the primary energy corresponds to the heat produced by the combustion of uranium in the reactor, the secondary energy is the electricity produced in the nuclear power plant (around a third of the primary energy), the final energy is that which reaches the consumer's electricity...
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Trends in energy demand
Oil, natural gas and coal: dependence
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