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1. Energy Efficiency  When energy is converted from one form to another some energy is converted into other unintended forms.

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Presentation on theme: "1. Energy Efficiency  When energy is converted from one form to another some energy is converted into other unintended forms."— Presentation transcript:

1 1

2 Energy Efficiency  When energy is converted from one form to another some energy is converted into other unintended forms.

3 Energy Efficiency Energy Conversion Device Energy Input Useful Energy Output Energy Dissipated to the Surroundings

4 Vehicle Efficiency – Gasoline Engine 25% Of the gasoline is used to propel a car, the rest is “lost” as heat. i.e an efficiency of 0.25

5 Efficiency of Some Common Devices Device Electric Motor Home Oil Furnace Home Coal Furnace Steam Boiler (power plant) Power Plant (thermal) Automobile Engine Light Bulb-Fluorescent Light Bulb -Incandescent 90 65 55 89 36 25 20 5 Efficiency

6 Efficiency of Energy Conversion  If we are more efficient with the energy we already have there will be less pollution, less reliance on foreign energy sources.

7 Video  http://www.youtube.com/watch?v=QG3HNQi EaTM http://www.youtube.com/watch?v=QG3HNQi EaTM  http://www.youtube.com/watch?v=ByCOTG2 -mhg http://www.youtube.com/watch?v=ByCOTG2 -mhg

8 Assignment  Section 3.2 Questions 1-6

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