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Energy Resources

 
Renewable
Primary Source
 Energy Resource
The Sun is the primary source of energy Billions of photons of electromagnetic energy leave the Sun and hit our Earth every second. The energy can be used directly by us in photo-voltaic cells and in solar heating panels.      
The Sun is the primary source of energy Using once living matter used as a fuel - wood, dung, seeds, plant oil etc. By photosynthesis the Sun's energy combines water and carbon dioxide to make plant material - this is eaten by animals to make animal material      
The Sun is the primary source of energy Uneven heating of the atmosphere by the Sun causes pressure differences that result in movement of air masses The kinetic energy of the wind is used to turn sails of wind mills and aerogenerators      
The Sun is the primary source of energy The wind (see above) blowing on the water makes waves. 'Ducks' and OWCs can be used to convert the kinetic energy to electricity      
The Sun is the primary source of energy The Sun powers the water cycle and HEP uses water falling under gravity (waterfalls and fast flowing rivers) to turn turbines to make electricity The Sun powers the water cycle allowing water to gain gravitational potential energy by being lifted up into the clouds and falling on high places like mountain tops      
The nuclear energy of the radioactive isotopes in the rock is the primary source
 Hot rocks within the earth heat underground streams Radioactive materials release heat energy when they decay. This is one of the main reasons why the Earth is still hot inside      
The gravitational pull of the moon is the primary source The gravitational pull of the moon (and the Sun - but its effect is smaller as it is so far away!) on the oceans causes the tides The movement of the water within river mouths (estuaries) is made to flow through sluice gates in a dam and thereby used to turn turbines to make electricity      
Non-Renewable
The nuclear energy of the fissile isotopes in the Earth's crust is the primary source
 Uranium-235 atom nuclei split to release energy by the process of fission. They are a store of nuclear (or atomic) energy Heat energy is produced when the atom nucleus splits The heat is used to boil water and the pressure of the steam produced is used to turn turbines to make electricity    
The Sun is the primary source of energy Fossil fuels - highly compressed, ancient once living matter (prehistoric biomass!) - a very concentrated form of chemical energy. Made by photosynthesis and high pressure over a long time    
   
   
LOJ - August 2003

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