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15.3 Energy Resources

15.3 Energy Resources. Review. What is energy, kinetic, potential? What is energy conversion? What’s the law of conservation of energy?. Nonrenewable Energy Resources.

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15.3 Energy Resources

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  1. 15.3 Energy Resources

  2. Review • What is energy, kinetic, potential? • What is energy conversion? • What’s the law of conservation of energy?

  3. Nonrenewable Energy Resources • Nonrenewable Energy Resources- exist in limited quantities and, once used, cannot be replaced except over the course of millions of years • These resources are being used much faster than they can be replaced… • Include: oil, natural gas, coal and uranium

  4. Nonrenewable Energy Resources • Fossil Fuels- were formed underground from the remains of once-living organisms • Ex: oil, natural gas, and coal • Currently, fossil fuels account for the great majority of the world’s energy use • Their use creates pollution 

  5. Renewable Energy Resources • Renewable energy resources- resources that can be replaced in a relatively short period of time. • Most renewable resources originate directly or indirectly from the sun • Include: hydroelectric, solar, geothermal and wind energy

  6. 1) Hydroelectric Energy • Hydroelectric Energy- energy obtained from flowing water • Some hydroelectric power plants simple depend upon the natural flow of water in a river • Most rely on dams build across rivers • A dam blocks the flow of water, storing potential energy that is converted into kinetic when the water is released • Low cost to produce, lack of pollution

  7. 2) Solar Energy • Solar Energy- sunlight that is converted into usable energy • Passive solar designs use sunlight to heat a building without using machinery • For example. Sunlight passing through the windows of a house may be absorbed by thick walls and then radiate thermal energy • In an active solar system, sunlight heats flat collection plates through which water flows • The heated water may be used directly for the buildings hot water needs, or it may be used to heat the house

  8. **Solar Energy is non-polluting but for areas where cloudy days are frequent, solar energy is less practical

  9. 3) Geothermal Energy • Geothermal Energy- thermal energy beneath the Earth’s surface • The geothermal power plant pumps water into the ground, where it turns into steam. The steam is then used to drive electric generators. • Non polluting, but it not widely available

  10. Conserving Energy Resources • Energy Conservation- finding ways to use less energy or use energy more efficiently • Making appliances, cars, and even light bulbs more energy efficient is a way or reducing energy use while still enjoying its benefits • Energy-efficient purchases often cost more initially, but can save money in fuel costs over time

  11. Page 466 • Problems 1-5

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