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Main sources of energy
Main sources of energy
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  1. 1. Energy
  2. 2. What is energy?
  3. 3. Energy: Energy is the ability to do work, to make things happen, and to cause changes.  Energy cannot be made or destroyed; it can only be changed into different forms.
  4. 4. There are two categories of energy..  Renewable: Energy sources that are replaced naturally  Non-Renewable: Energy sources that are limited and will end
  5. 5. What are some examples?
  6. 6. There are 2 types of non-renewable energy…
  7. 7. Fossil Fuels A fuel (as coal, oil, or natural gas) formed in the Earth from plant or animal remains
  8. 8. Fossil Fuels  Advantages:  It is an easy and a regular way of producing energy.  It is not so expensive to build power plants.  Disadvantages:  They will run out one day.  It pollutes a lot; it emits greenhouse gases, acid rain and it pollutes rivers and lakes.
  9. 9. Nuclear  Nuclear energy is energy that is stored within the nucleus of atoms. The only way for this energy to be released is through the splitting of or joining of atomic nuclei.
  10. 10. Nuclear Energy  Advantages:  It produces a great amount of energy  It doesn’t produce acid rain or greenhouse gases  Disadvantages:  It can cause serious damage and accidents  It’s very difficult and dangerous to keep radioactive waste  It’s expensive
  11. 11. There are 8 types of renewable energy…
  12. 12. Hydraulic  When electricity is made from flowing water.
  13. 13. Hydraulic  Advantages:  It’s free  It’s easy to keep  It’s clean  The reservoirs regulate the flow of the rivers  Disadvantages:  It’s expensive  The water supply is irregular  The reservoirs change the environment  Heat waves can cause a smaller amount of this energy
  14. 14. Wind  The energy from wind can be captured to generate electricity. We use windmills to do this.
  15. 15. Wind  Advantages:  It’s free and clean  It won’t run out  There are little safety risks with wind turbines  It’s a quick way of producing mechanical energy  Disadvantages:  The power of generators are very expensive  It’s production is not regular  It’s very noisy and does not look nice in nature
  16. 16. Solar  Energy that comes from the sun and is then changed into electricity
  17. 17. Solar  Advantages:  it’s free  It’s clean  The sun will always be there during our lifetime so it won’t run out  Disadvantages:  A great amount of land is needed  It’s expensive  It’s production is not always happening  Bad impact on the environment
  18. 18. Biomass  Biomass is any material from plants or animals that we can convert into energy. Examples are wood, corn, manure or garbage. Most commonly, we burn these materials to make energy.
  19. 19. Biomass  Advantages:  It reduces waste  It creates little rubbish  Disadvantages:  It pollutes since it produces CO2  It’s limited  It takes a long time to be created  Many trees are cut down
  20. 20. Geothermal  "Geo" means "from the earth," and "thermal" means "heat," so this type of energy is found under the earth. The hot lava from a volcano and the hot steam from a geyser both come from underground heat and we can use that same type of heat in our homes.
  21. 21. Geothermal  Advantages:  It’s clean, it doesn’t produce big amounts of waste  It’s quite regular  It’s endless  Disadvantages:  We need advanced and very expensive technology  It’s expensive  It deteriorates the landscape and the ecosystem  It cannot be transported
  22. 22. Solid Urban Waste  Energy can be gathered from waste (trash or rubbish) by burning it or changing it to methane gas
  23. 23. Solid Urban Waste  Advantages:  It reduces waste  Disadvantages:  It pollutes  It generates poisonous/toxic products and releases heavy metals
  24. 24. Tidal Energy  Energy produced by the tides of the ocean. Tides are produced by the pull of gravity from the Moon as well as the spin of the Earth. There is a lot of energy in the movement of that much water.
  25. 25. Tidal Energy  Advantages:  Tides are free and will not run out  It doesn’t pollute  It’s noiseless – it is a quiet type of energy  Disadvantages:  It had a negative impact on the landscape, flora and fauna
  26. 26. Wave Energy  Energy gotten from the waves of the ocean. Waves are formed by wind moving across the surface of the ocean. A large amount of energy is stored in waves.
  27. 27. Wave Energy  Advantages:  It’s clean and free.  Wave power does not produce greenhouse gases.  Disadvantages:  The facilities and equipment are very expensive.  Electricity production depends on the wave speed, height and length.
  28. 28. How can we save energy?
  29. 29. Energy Conservation  By using less energy  Turning off water when we don’t need it  Unplugging electronics  Not leaving the lights on  Shorter showers
  30. 30. Energy Efficiency  We talk about energy efficiency when we try to reduce the amount of energy required to provide the same products and services.  Using a washing machine that saves energy
  31. 31. Recycling  This involves the use of waste or old materials to make new ones. The energy needed to recycle many materials is less than the energy required to make it from scratch.
  32. 32. What energies we use..