1. Sustainable Energy
Wind energy is a sustainable resource. What does this mean?
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Are all of our sources of energy sustainable?

2. Sustainable Development & Energy
What is sustainable development?
‘Sustainable development is development which meets the needs of the present without compromising the ability of future generations to meet their own needs.’
What does this mean in terms of energy?
Which of the energy resources that we use could be classed as a sustainable resource?
Is there any difference in sustainable energy resources and renewable energy resources?

3. Exercise: Resources

4. Geothermal Energy

5. Geothermal power station located in Kenya.
Geothermal Energy
Advantages:
Renewable.
Cheap running costs when set-up.
No air pollution*.
Disadvantages:
Geothermal power station located in Kenya.
Few areas suitable.
Expensive to set-up.
Image copyright JSH Education Ltd
Photographer - Paul Monaghan
*Some geothermal power stations allow the steam to escape and the gas hydrogen sulfide can be emitted.
Often needs combining with other energy resources to generate electricity as the water reaching the surface is not hot enough.
Volcanic regions are often unstable.

6. IT: Photovoltaic Cells

7. Falling Water

8. Totally Renewable?

9. IT: Units Used

10. A Closer Look
In fuel-burning power stations, steam at high pressure, turns a turbine which then turns a generator - generating electricity.

11. Insulating The Home - Windows

12. Turn That Light Off!

13. Exercise: Efficiency Calculation
A kettle is supplied with 120J of electrical energy. It converts this into useful thermal energy at an efficiency of 0.5 (or 50%). How much thermal energy does the kettle produce?
Efficiency = desired output energy/total input energy
Desired output energy = efficiency x total input energy
Desired output energy = 0.5 x 120J
Desired output energy = 60J

14. Exercise: Energy Efficient Bulbs
Different bulbs have different efficiencies. Which of the bulbs below is the most efficient?
Input energy: 200J
Input energy: 140J
Desired output energy: 36J
Desired output energy: 91J
Efficiency: ____
0.18
Efficiency: ____
0.65
This bulb is the most efficient

15. Looking At Convection

16. Looking At Convection

17. Heating A Room

18. IT: Increasing Frequency