Ch03

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Ch03

  1. 1. Energy Chapter 3 Great Idea: The many different forms of energy are interchangeable, and the total amount of energy in an isolated system is conserved
  2. 2. Chapter Outline <ul><li>The Great Chain of Energy </li></ul><ul><li>Forms of Energy </li></ul><ul><li>The Interchangeability of Energy </li></ul><ul><li>The First Law of Thermodynamics: Energy is Conserved </li></ul><ul><li>The United States and Its Energy Future </li></ul>
  3. 3. The Great Chain of Energy
  4. 4. Oil Pump Bringing Is up Stored Solar Energy
  5. 5. Scientifically Speaking <ul><li>Energy and force </li></ul><ul><li>Work </li></ul><ul><ul><li>Force over distance </li></ul></ul><ul><ul><li>Equation: W=Fd </li></ul></ul><ul><ul><li>Joule </li></ul></ul><ul><li>Energy </li></ul><ul><ul><li>Ability to do work </li></ul></ul><ul><li>Power </li></ul><ul><ul><li>Rate at which work is done </li></ul></ul><ul><ul><li>Equation: P=W/t </li></ul></ul><ul><ul><li>Watts </li></ul></ul>
  6. 6. Important Terms
  7. 7. Weightlifter Applies a Force over a Distance
  8. 8. Athletes Strive to Generate Maximum Power
  9. 9. Forms of Energy
  10. 10. Kinetic Energy <ul><li>Energy of moving object </li></ul><ul><li>Mass and speed </li></ul><ul><ul><li>Directly proportional to kinetic energy </li></ul></ul><ul><li>Equation: E k =½mv 2 </li></ul>
  11. 11. James Watt’s First “Sun and Planet” Steam Engine
  12. 12. Breaching Humpback Whale has Kinetic Energy because He is Moving
  13. 13. Potential Energy <ul><li>Energy waiting to be released </li></ul><ul><li>Gravitational potential energy </li></ul><ul><ul><li>Equation: E P =mgh </li></ul></ul><ul><li>Chemical potential energy </li></ul><ul><li>Electrical potential energy </li></ul><ul><li>Magnetic potential energy </li></ul>
  14. 14. Potential Energy Comes in Many Forms
  15. 15. Heat or Thermal Energy <ul><li>Atoms and Molecules </li></ul><ul><ul><li>Bonding </li></ul></ul><ul><li>Motion </li></ul><ul><ul><li>Force </li></ul></ul><ul><li>Thermal Energy </li></ul><ul><ul><li>Heat </li></ul></ul><ul><ul><li>Random kinetic energy of atoms and molecules </li></ul></ul>
  16. 16. Discovering the Nature of Heat
  17. 17. Heat Is a Form of Energy
  18. 18. Wave Energy <ul><li>Wave </li></ul><ul><li>Sound wave </li></ul><ul><li>Seismic wave </li></ul><ul><li>Electromagnetic radiation </li></ul>
  19. 19. Mass as Energy <ul><li>Radioactivity </li></ul><ul><li>Einstein </li></ul><ul><ul><li>Equation: E=mc 2 </li></ul></ul><ul><ul><li>Energy (Joules) = mass (kg) x speed of light (m/s) 2 </li></ul></ul><ul><li>Can convert mass to energy </li></ul>
  20. 20. The Interchangeability of Energy
  21. 21. Some Forms of Energy
  22. 22. Example of Energy Changing from One Form to Another
  23. 23. Energy Changes Form during a Bungee Jump
  24. 24. Energy for Life and Trophic Levels
  25. 25. The First Law of Thermodynamics: Energy is Conserved
  26. 26. Energy is Conserved <ul><li>System </li></ul><ul><ul><li>Closed </li></ul></ul><ul><ul><li>Open </li></ul></ul><ul><li>Law of Conservation of Energy </li></ul><ul><ul><li>Total energy in system is conserved </li></ul></ul><ul><ul><li>Type of energy vs. total </li></ul></ul>
  27. 27. Open System
  28. 28. Closed System
  29. 29. Lord Kelvin
  30. 30. The United States and Its Energy Future
  31. 31. The U.S. & Its Energy Future <ul><li>Fossil Fuels </li></ul><ul><ul><li>Oil, coal, natural gas </li></ul></ul><ul><li>Renewable Energy Sources </li></ul><ul><ul><li>Solar energy, wind </li></ul></ul><ul><li>Base Load vs. Peak Load </li></ul>
  32. 32. Sources of Energy for the U. S. & Other Industrial Nations
  33. 33. Electricity Generated from Wind Turbines
  34. 34. Solar Photovoltaic Panels Can Be Used in Various Ways
  35. 35. Solar Thermal Facility in Barstow, California
  36. 36. Transportation <ul><li>Electric vehicles </li></ul><ul><ul><li>Battery </li></ul></ul><ul><ul><li>Short range </li></ul></ul><ul><li>Hybrid vehicles </li></ul><ul><ul><li>Gas and battery </li></ul></ul><ul><ul><li>Many new models </li></ul></ul><ul><li>Fuel Cell vehicles </li></ul><ul><ul><li>Hydrogen </li></ul></ul><ul><ul><li>Uses fossil fuel to create hydrogen </li></ul></ul>
  37. 37. Hybrid Car – Chevy Volt

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