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DO NOW

DO NOW. 1. Turn in your ecological footprint activity. 2. How do we get and use energy?. How do we make electricity?*. Definitions. Renewable Energy A resource that can be replenished as it is consumed. Nonrenewable Energy A resource that cannot be replenished as it is consumed . Examples.

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DO NOW

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  1. DO NOW 1. Turn in your ecological footprint activity. 2. How do we get and use energy?

  2. How do we make electricity?*

  3. Definitions • Renewable Energy • A resource that can be replenished as it is consumed • Nonrenewable Energy • A resource that cannot be replenished as it is consumed

  4. Examples Renewable Energy Nonrenewable Energy Coal Natural Gas Petroleum (oil) Nuclear Fission • Sun (Solar Energy) • Water • Wood • Wind • Biomass (Biofuel) • Geothermal • Ocean Tides

  5. In 2000: Energy in US comprised of (Yes- I am aware they don’t add up- close enough) Oil and Natural Gas 63% Coal 23% Nuclear 8.2% Hydropower 3.1%

  6. Natural Gas • Methane – piped into homes and offices • Use for heating, cooking, washing & drying

  7. Natural Gas Advantages • Cleanest burning Fossil Fuel (few pollutants when burned) • Available in the U.S.

  8. Natural Gas Disadvantage • Contributes to greenhouse effect • EXPLOSION!

  9. Petroleum (Oil) • Black thick liquid pumped from below earth’s surface • Refined • - separates the gasoline (used for transportation) and uses remaining for other products (rubber, detergents, fertilizer)

  10. Petroleum (Oil) Advantages • Maximize amount of gas and oil obtained • Wide variety of uses

  11. Petroleum (Oil) Disadvantage • Increases greenhouse gases • Acid Rain • Ground Level Ozone

  12. Coal • Most Abundant Fossil Fuel • 1/3 of coal in US from Appalachian Coal Region • Used for electricity

  13. Coal Advantages • Can be found in many places around the world • Easy to use • Cheap

  14. Coal Disadvantage • Not as widely used • Cost of mining • Pollution • Mining Changes environment • Releases Greenhouse Gases

  15. Nuclear Fission* • Splitting of uranium atom • Releases A LOT of heat energy • Used to make electricity

  16. Nuclear Fission

  17. Nuclear Fission Advantages* • 1/5 US electricity • Produce NO carbon dioxide • Small amount of Uranium = A LOT of energy

  18. Nuclear Fission Disadvantage • Radioactive waste products • Meltdowns • Radiation exposure to workers • Mining and refining Uranium takes a lot of energy

  19. Sun (Solar Energy)* • Sun’s rays (solar radiation) reaching earth • Converted to heat or electricity • TYPES • Direct Solar • PV Cells

  20. Solar Energy Advantages • Cleanest Energy Source (no air pollution)

  21. Solar Energy Disadvantage • Amount of sunlight is not consistent • A large surface area is required to collect enough energy • Expensive

  22. Wind Power • Unequal heating of earth produces wind • Converted into mechanical energy  electricity • Winds over 8mph used to make electricity

  23. Wind Power Advantages • Less Expensive than in past • No emissions • Small physical footprint

  24. Wind Power Disadvantage • Unpredictable • Visual Impact • Sound • Bird deaths

  25. Hydroelectric (Falling Water)* • Falling water turns turbines • Degree of power determined by • amount of water • Distance water falls

  26. Hydroelectric (Falling Water)Advantages • No pollution

  27. Hydroelectric (Falling Water)Disadvantage • Fewer places for dams • Dam built on a river creating a lake where there used to be land. • Fish reproduction • Expensive to build

  28. Ocean Tides • Tides are caused by gravitational pull of moon & sun • 10 feet needed for energy • As water moves in or out, moves turbine

  29. Ocean Tides Advantages • More predictable • Free

  30. Ocean Tides Disadvantage • Affects plants and animals

  31. Geothermal • Energy deep within earth • Heat energy remaining in earth from gravitational formation of earth • Geysers • Used to heat homes, greenhouses, & factories

  32. Geothermal Advantages • Cost Effective • Clean (no emissions) • Efficient

  33. Geothermal Disadvantage • Drill into earth • Some harmful gases • Not many places for geothermal power plants

  34. Biofuels • GARBAGE! • As bacteria decompose waste, they make methane • Power plants and cars can use the methane gas for energy

  35. Biofuels Advantages* • Can find waste anywhere • Cheap

  36. Biofuels Disadvantage • Air pollution, depending on the type • Space (grown fuel)

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