renewable sources

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  • Renewable sources
    • What is a renewable source?
      • Renewable energy resources can be replaced, and will not run out. Be careful - it is not true to say that they can be re-used.
        • Give an example of a renewable energy source.
          • Biomass, Wind power, Water power, Solar power.
            • What's Biomass?
              • Biomass fuels come from living things. Wood is a biomass fuel. As long as we continue to plant new trees to replace those cut down, we will always have wood to burn. Just as with the fossil fuels, the energy stored in biomass fuels came originally from the Sun.
            • What is wind power?
              • Wind is caused by huge convection currents in the Earth's atmosphere, driven by heat energy from the Sun. The moving air has huge amounts of kinetic energy, and this can be transferred into electrical energy using wind turbines. Wind turbines cannot work if there is no wind, or if the wind speed is so high it would damage them.
            • What is Water Power?
              • Moving water has kinetic energy. This can be transferred into useful energy in different ways. For example:wave machines use the up and down movement of waves to turn electricity generatorstidal barrages are built across the mouths of rivers. As water moves in or out of the river mouth when the tide turns, the kinetic energy in the water is used to turn electricity generators.
            • What is solar power?
              • Solar cellsSolar cells are devices that convert light energy directly into electrical energy. You may have seen small solar cells on calculators. Larger arrays of solar cells are used to power road signs, and even larger arrays are used to power satellites in orbit around Earth.Solar panelsSolar panels are different to solar cells. Solar panels do not generate electricity. Instead they heat up water directly. A pump pushes cold water from a storage tank through pipes in the solar panel. The water is heated by heat energy from the Sun and returns to the tank. They are often located on the roofs of buildings where they can receive the most sunlight.


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