1. Renewable Energy The Re al Alternative?

2. Module Overview Lesson 1, The REal alternative Why, how much, when and what Lesson 1, The REal alternative Why, how much, when and what Principles Lesson 2, Which alternative? Your chance to research the options Lesson 2, Which alternative? Your chance to research the options Research Work- sheet At home Lesson 3, The Crunch! Present your case and use your vote Lesson 3, The Crunch! Present your case and use your vote Assessment

3. Why Bother? Because energy resources are limited –Oil and gas will run out, probably in your lifetime Because burning fossil fuels release greenhouse gases and pollutants –Affecting your environment and health Because you can do something about it –Using your energy and vote

4. Lesson 1: Does it all add up? How much power? Wind Rivers Waves Plants Use Supply Energy balance Sun How much power?

5. Part 1: How much energy do we use? In our home In our country In our world

6. Starting in YOUR Household How much energy do you use?

7. Calculating power and energy Brain thinking hard 100W Brain chilling 50W 4 hours 20 hours Average power = {Daily energy}/{Daily hours} = 58 watts (W) Daily energy = Power x time = (100 x 4) + (50 x 20) = 1400 watts hours

8. How much power per household? EquipmentGroupAve. power Lights1 TV2 Computers3 Cooking4 Washing5 Cars6 Food7 Heating8 Total average power per household????

9. Experiments Split into seven groups Use equipment supplied to estimate the average power consumed in a typical household Report back to the class when complete Use the information to estimate the total average power used by a typical family Consider the error involved in this estimation

10. How much power per person? 2kW/household but…..that’s not all ÷ Four per household? = 500W per person This is the power you actually use 1500W Transport and conversion Power source 1000W losses 100% 66% 33% 500W This is the power you measure

11. How much power per person? but…..that’s still not all You!! Domestic Power consumed 1500W ¼ 4500W Industrial/commercial Power consumed¾ 6000W You are responsible for about 6000W of power consumption!!!!

12. How much energy in world? ? but, most of the world don’t burn energy like us…yet! 6000W per person 38 TW World power use = X 6,400 million people (www.esa.un.org.gov) Actual total is 15 TW now (www.rcep.org.uk) Predicted to rise to 20 TW by 2020

13. Big numbers 1,000 watts = 1 thousand watts = 1 kilo-watt = 1 kW 1,000 kilo-watts = 1 million watts = 1 mega-watt = 1 MW 1 watt = standard unit of power = 1 joule per second = 1 W 1,000 mega-watts = 1 billion watts = 1 giga-watt = 1 GW 1,000 giga-watts = 1 trillion watts = 1 tera-watt = 1 TW ?m Grain of sand Less than 1mm 3 ?mm

14. Part 2: Where does the energy come from?

15. The sun provides more than 99.9% of our primary energy It is a nuclear reactor 200,000 trillion times more powerful than nuclear power stations

16. Power arriving at the earth is 200,000 TW (2x10 17 watts) But only one billionth of the power reaches earth 150 million km Solar energy

17. Checking the balance 6,000 Watts 15 tera watts Use Supply Energy balance Sun 200,000 tera watts

18. Where does the solar energy go? 2x10 17 Watts Stored as fossil fuels Wind Rivers Waves Plants Atmosphere Radiated back into space

19. Renewable Energy - Overview Sun Solar energy Wind energy Wave energy Hydro energy ?

20. Solar Energy - Heating Sun

21. Solar Energy Solar EnergyPhotovoltaics Charger Batteries Inverter Direct current devices Alternating current devices

22. Energy from Rivers (Hydro) Large schemes with reservoirs and dams Small schemes without reservoirs or dams Supply town and cities Supply villages

23. Demonstration Several demonstrations of energy processes around classroom –Evaporation-condensation cycle –Solar-powered “wind turbines” –Wind-up radios –Tap water powered hydro-turbines Make a note of the energy conversions and estimate the power involved

24. Energy from Rivers (Hydro) Dam

26. Energy from Wind

28. Wind Turbine Generators Electrical energy Your house Wind energy

29. Energy from Waves

30. Electricity

31. Other Wave Devices

32. Energy from Biomass

34. 200,000 TW Fossil fuels Atmosphere Summary Wind Waves Rivers Plants Solar 6kW 15 TW

35. Coming next………Your turn! Group 1: Solar energy Group 2: Wind energy Group 3: Hydro energy Group 6: Wave energy Group 7: Energy transport Group 5: Nuclear energy

36. The End