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Recap of Energy Production Hydroelectric Energy Generation Nuclear transport containers

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Presentation on theme: "Recap of Energy Production Hydroelectric Energy Generation Nuclear transport containers"— Presentation transcript:

1 Recap of Energy Production Hydroelectric Energy Generation Nuclear transport containers Pro’s and Con’s for wind (from London England) Doc Zone special

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

3 ENERGY Efficiency

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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?

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


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