1. Power stations Power Power generation Energy density 14May 2012 11 Physics8.1, 8.2, 8.3 Power generationTsokos 7.1

2. Define Power...

3. Define efficiency...

4. Power generation -CoalOil Natural Gas NuclearHydrootherTotal Electricity (TW ｈ /year) 8,2631,1114,3012,7313,28856820,261 Proportion 41 ％ 5％5％ 21 ％ 13 ％ 16 ％ 3%100% 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 Fuelenergy density MJkg -1 Coal22-35 Oil42 Natural gas54 Uranium (nuclear)9x10 7 Waste10 Ethanol biofuel30 Hydrogen142

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 CO 2 extraction has environmental costs non-renewable