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  • Created by: niamh151
  • Created on: 26-01-17 10:40

Why do we need energy

People need energy to keep them alive , warm and able to move . Over time , demand for energy has grown . There are more people now than at any time in the past , and the population continues to expand.

Transport , bulidings , possesions and communication need more energy than ever before. People travel further and faster and have diffrent expections about their lifestyle. Understanding about the energy sources available is important when making choices.

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Energy sources

Energy is conserved , meaning it can neither be created nor destroyed . the energy we use forn heat, movement, and light must all come from an energy source. for example , we can realease energy by burning fuels or we can use energy carried by radiation from the sun.

A primary energy source is one that is found or occurs naturally examples include fuels such as coal, oil, natual gas, and wood. Wind waves , and sunlight are also primary energy souces.

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Fuels

A fossil fuel is one that has built up over millions of years by the decay of plant and animal remains. Coal , Petroleum and natural gas are all fossil fuels. We are using them up far more rapidly than they can form.

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Sustainable energy

Our current use of energy sources is not sustainable and cannot continue indefinitley.Some sources are running out, and some of our energy use is damaging the environment. Government and indivicals must decide how to reduce demand for energy and plan which energy sources to use in the future. To decide what to do , we need to know some facts about the amount of energy we use.

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