1. Recap of Energy Production Hydroelectric Energy Generation http://www.youtube.com/watch?v=cEL7yc8R42k Nuclear transport containers http://www.youtube.com/watch?v=1mHtOW-OBO4 http://www.youtube.com/watch?v=1mHtOW-OBO4 Pro’s and Con’s for wind http://www.youtube.com/watch?v=8btlmWn0xdY http://www.youtube.com/watch?v=8btlmWn0xdY (from London England) http://www.youtube.com/watch?v=WJgYZfX4lLc Doc Zone special

2. What are the impacts – environmental, human health, economic…?

3. ENERGY Efficiency

5. % Efficiency Comparison of how much useful energy is converted in an energy transformation No energy transformation is 100% efficient, energy is lost in the form of heat, sound…

6. Units for Energy (E) Energy can be measured with many different units: Joules (J) kiloJoules (kJ) Calories (Cal) kiloWatt hours (kW∙h) Increase Unit Energy Size James Watt James Prescott Joule

7. Calculation % efficiency = energy out x 100% energy in % efficiency = E out x 100% E in NOTE: units for energy in and out must match

8. Sample Problem A light uses 230,000J of energy to produce 16,250J of light energy. What is the % efficiency?

9. Sample Problem 2 A refridgerator uses 450kWh of energy. If there is 497kWh of energy input to run the fridge how efficient is the refridgerator?

11. Energy efficient electronics are marked with the energy star symbol!