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Current generation

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Current generation

  1. 1. CURRENT GENERATION
  2. 2. ELECTROMAGNETIC INDUCTION Induced current is produced from a changing magnetic field. Called electromagnetic induction
  3. 3.  Fleming right hand rule is used to determine the direction of induced current when a conductor cuts through the magnetic field lines perpendicular.
  4. 4.  The bulb is lighted when a magnet moves into a solenoid or coil. The magnetic lines are cut by the solenoid When the magnet is remain static, no induced current available
  5. 5. FARADAY’S LAW
  6. 6. LENZ’S LAW INDUCED CURRENT IS ALWAYS FLOWS IN SUCH A DIRECTION SO AS TO OPPOSE THE CHANGE (MOTION) PRODUCING IT
  7. 7. DIRECTION OF INDUCED CURRENT When the North pole of a magnet moved into a solenoid, the end P becomes a North pole to produce a force of repulsion to oppose the change of magnet motion. Galvanometer is deflected to ………
  8. 8. DYNAMO APPLICATION OF ELECTROMAGNETIC INDUCTION Dc generator
  9. 9. Working principle of dc generator
  10. 10.  The coil is rotated by external force and cuts the magnetic force. An alternate e.m.f is induced in the coil, but a dc output is obtained by using split ring commutator. The two halves of the split ring commutator exchange contact with the carbon brushes every half rotation The cutting of magnetic flux is maximum when the coil is at horizontal position. It decreases when as the coil rotates from horizontal to vertical position. Magnitude of induced flux changes whenever the position of coil changes.
  11. 11. AC GENERATION
  12. 12.  If the split ring commutator is replaced with two slip rings, the output is ac. The slip rings are always in contact with the same carbon brush. The output current changes direction every half turn.

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