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Power stations

14May 2012. Power stations. Power Power generation Energy density. 11 Physics 8.1, 8.2, 8.3 Power generation Tsokos 7.1. Define Power. Power is the rate at which work is done or energy is transferred in Js -1 or W

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Power stations

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  1. 14May 2012 Power stations Power Power generation Energy density 11 Physics 8.1, 8.2, 8.3 Power generation Tsokos 7.1

  2. Define Power... Power is the rate at which work is done or energy is transferred in Js-1 or W where P is the power in Watts, E is the energy transferred in Joules, and t is the time taken in seconds

  3. Define efficiency... Efficiency is the proportion of useful energy transferred.

  4. Power generation Source of Electricity (World total year 2008) Sources of electricity in France in 2006

  5. Animal power stations: How many would be needed for the equivalent of a 1GW nuclear power station?

  6. Energy density

  7. 1. Calculate the mass of oil needed to power a 100Watt lightbulb for 1hour (efficiency is 35%).2. Calculate the mass of uranium needed for a 1GW power station each year.3. Calculate the mass of Coal burned in the world each year. By what proportion does this increase the concentration of CO2 in the atmosphere (currently 3000Gigatonnes)?

  8. Image: http://en.wikipedia.org/wiki/File:Mauna_Loa_Carbon_Dioxide-en.svg

  9. Fossil fuels- coal, oil and natural gas Advantages • high energy density • easy to transport • relatively cheap • stations can be sited anywhere with water and transport links • direct heating Disadvantages • pollute, especially acid rain • produce CO2 • extraction has environmental costs • non-renewable

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