Ch. 3  Sec. 2 Electricity, Magnetism & Motion
Electrical & Mechanical Energy <ul><li>= ability to move an object some distance </li></ul><ul><li>=assoc. w/ electric cur...
<ul><li>When current-carrying wire is placed in magnetic field, </li></ul><ul><li>electrical energy    mechanical energy ...
Galvanometer <ul><li>Device that measures small currents </li></ul><ul><li>Converts electrical energy    mechanical energ...
Galvanometer
Electric Motor <ul><li>Device that uses electric current to turn axle </li></ul><ul><li>Converts electrical energy    mec...
 
Parts of a Motor <ul><li>device that reverses flow of current  </li></ul>Brushes and commutator   <ul><li>Commutator = </l...
Parts of a Motor <ul><li>contact points that connect commutator to current source </li></ul>Brushes and commutator   <ul><...
Parts of a Motor <ul><li>wires wrapped around iron core </li></ul>Armature   <ul><li>Armature =   </li></ul>
armature
 
Armature In this figure, the armature winding has been left out so that it is  easier to see the commutator in action. The...
MOTORS EVERYWHERE ! <ul><li>Look around your house and you will find that it is filled with electric motors. </li></ul>
The fan over the stove and in the  microwave oven   The blender  The can opener  The  refrigerator  –  Two or three in fac...
In the garage, there is an electric motor in   <ul><li>The  washer   </li></ul><ul><li>The  dryer   </li></ul><ul><li>The ...
<ul><li>The fan  </li></ul><ul><li>The electric toothbrush  </li></ul><ul><li>The  hair dryer   </li></ul><ul><li>The  ele...
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6th Grade Ch 3 Sec 2 Electricity, Magnetism and Motion

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6th Grade Ch 3 Sec 2 Electricity, Magnetism and Motion

  1. 1. Ch. 3 Sec. 2 Electricity, Magnetism & Motion
  2. 2. Electrical & Mechanical Energy <ul><li>= ability to move an object some distance </li></ul><ul><li>=assoc. w/ electric currents </li></ul><ul><li>= due to an object’s movement or position </li></ul>Energy Mechanical energy Electrical energy
  3. 3. <ul><li>When current-carrying wire is placed in magnetic field, </li></ul><ul><li>electrical energy  mechanical energy </li></ul>
  4. 4. Galvanometer <ul><li>Device that measures small currents </li></ul><ul><li>Converts electrical energy  mechanical energy </li></ul><ul><li>HOW IT WORKS: </li></ul><ul><ul><li>Current passes thru loops of wire in magnetic field </li></ul></ul><ul><ul><li>Magnetic field from wire interacts with magnet’s field </li></ul></ul><ul><ul><li>Causes loops of wire & pointer attached to loops to rotate ½ turn </li></ul></ul><ul><ul><li>Current does not reverse </li></ul></ul>
  5. 5. Galvanometer
  6. 6. Electric Motor <ul><li>Device that uses electric current to turn axle </li></ul><ul><li>Converts electrical energy  mechanical energy </li></ul><ul><li>Loop of current-carrying wire spins continuously </li></ul>
  7. 8. Parts of a Motor <ul><li>device that reverses flow of current </li></ul>Brushes and commutator <ul><li>Commutator = </li></ul>
  8. 9. Parts of a Motor <ul><li>contact points that connect commutator to current source </li></ul>Brushes and commutator <ul><li>Brushes = </li></ul>
  9. 10. Parts of a Motor <ul><li>wires wrapped around iron core </li></ul>Armature <ul><li>Armature = </li></ul>
  10. 11. armature
  11. 13. Armature In this figure, the armature winding has been left out so that it is easier to see the commutator in action. The key thing to notice is that as the armature passes through the horizontal position, the poles of the electromagnet flip. Because of the flip, the north pole of the electromagnet is always above the axle so it can repel the field magnet's north pole and attract the field magnet's south pole.
  12. 14. MOTORS EVERYWHERE ! <ul><li>Look around your house and you will find that it is filled with electric motors. </li></ul>
  13. 15. The fan over the stove and in the microwave oven The blender The can opener The refrigerator – Two or three in fact: one for the compressor, one for the fan inside the refrigerator, as well as one in the icemaker The mixer Probably even the clock on the oven. Starting in the kitchen, there are motors in:
  14. 16. In the garage, there is an electric motor in <ul><li>The washer </li></ul><ul><li>The dryer </li></ul><ul><li>The electric screwdriver </li></ul><ul><li>The vacuum cleaner </li></ul><ul><li>The electric saw </li></ul><ul><li>The electric drill </li></ul>
  15. 17. <ul><li>The fan </li></ul><ul><li>The electric toothbrush </li></ul><ul><li>The hair dryer </li></ul><ul><li>The electric razor </li></ul>Even in the bathroom, there’s a motor in:

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