Electromagnetism And Motion

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Electromagnetism And Motion

  1. 1. Electromagnetism and Motion Page 85
  2. 2. Students will be able to Describe a galvanometer Explain electric motors Explain how generators work Contrast AC/DC currents Describe how a transformers work
  3. 3. Electrical Energy <ul><li>Occurs when you have motion between magnets </li></ul>86
  4. 4. Galvanometers <ul><li>Take advantage of motion to measure small currents </li></ul>87
  5. 5. Motors <ul><li>Three key parts </li></ul><ul><li>Armature – Loop just like in galvanometer </li></ul><ul><li>Rotates in magnetic field </li></ul><ul><li>Brushes – Carry charge from source </li></ul><ul><li>Do not move </li></ul><ul><li>Commutator – Carries current to armature </li></ul><ul><li>Attached to armature and moves. </li></ul>88
  6. 6. Motors 88
  7. 7. Induction <ul><li>When a wire moves through a magnetic field </li></ul>94
  8. 8. Induction 95 Or move a magnet through wires
  9. 9. Direct Current <ul><li>DC </li></ul><ul><li>The electric current flows in one direction only </li></ul><ul><li>Batteries </li></ul>96
  10. 10. Alternating Current <ul><li>AC </li></ul><ul><li>Current repeatedly changes direction </li></ul><ul><li>Used in homes, school… </li></ul><ul><li>Allows for easier control </li></ul><ul><li>Easily raised or lowered </li></ul><ul><li>High for shipping </li></ul><ul><li>Lower for home </li></ul>97
  11. 11. Generators <ul><li>The opposite of an electric motor </li></ul>98
  12. 12. Generators <ul><li>Turbines </li></ul>99
  13. 13. Transformer <ul><li>A device that can increase or decrease voltage </li></ul>99
  14. 14. Types <ul><li>Step-up vs Step-down </li></ul>100
  15. 15. Devices <ul><li>Big equipment – Step up voltage </li></ul><ul><li>Fluorescent lights, TV </li></ul><ul><li>Small stuff – Step down </li></ul><ul><li>Electronic games, ipod, CD player… </li></ul><ul><li>(12V) </li></ul>101
  16. 16. Question of Day <ul><li>You are a television reporter covering the opening of a new dam that generates electricity. Write a short news story describing how a dam transforms mechanical energy from the motion of the water into electrical energy. </li></ul>

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