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  1. Magnetic Field | Week 1
    4 Topics
  2. Electromagnetic Field
    4 Topics
  3. Electromagnetic Induction
    6 Topics
  4. The Transformer
    5 Topics
  5. Simple A.C Circuit
    4 Topics
  6. Models of the Atom
    2 Topics
  7. Radioactivity
    3 Topics
  8. Half Life
    8 Topics
  9. Energy Quantization
    3 Topics
  10. Photoelectric Effect
    4 Topics
  11. Wave Particle Paradox
    3 Topics

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Lesson 3, Topic 6
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Direct Current (D.C) Generator

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A direct current is one that current always flow in one direction even though it may vary in value

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A direct current is obtained by connecting a split ring known as a commutator to an external resistance or load by split rings called commutators. The ring helps to reverse the connections to the external resistance in every half turn of the coil so that the current produced flows through the coil in the same direction 

To Produce Larger E.M.F in Ac or Dc Generators

  1. the armature should have a larger number of turns in the coil
  2. the coil should be wound on a soft iron core, to increase magnetic flux through the coil 
  3. a strong magnet to produce a strong magnetic field
  4. increasing the speed of rotation of the coil 


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