1. Energy Sources

2. Non-renewable?

3. Non-renewable Finite (being depleted – will run out) In general from a form of potential energy released by human action

4. Fossil fuels – Coal, oil, gas

5. Nuclear fuels

6. Renewable?

7. Renewable Will not run out (in the near future) Mostly directly or indirectly linked with the sun (the exception is tidal energy)

8. Photovoltaic cells

9. Active solar devices

10. Wind

11. Wave

12. Tidal

13. Biomass

14. World energy production Fuel% total energy production CO 2 emission g.MJ -1 Oil4070 Natural gas2350 Coal2390 Nuclear7- Hydroelectric7- Others< 1-

15. Energy Density

16. The energy that can be obtained from a unit mass of the fuel J.kg -1 If the fuel is burnt the energy density is simply the heat of combustion

17. Energy density Coal - 30 MJ.kg -1 Wood - 16 MJ.kg -1 Gasoline – 47 MJ.kg -1 Uranium – 7 x 10 4 GJ.kg -1 (70000000 MJ.kg -1 )

18. Your task?