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Question

Explain the working of a dynamo.


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Solution

Dynamo:

  1. A dynamo is a type of electrical generator that is used to create a conducting current with the help of a commutator.
  2. A dynamo used the laws of electromagnetism to create a direct conducting current or electric power from the rotation of the coil.
  3. Hence, a dynamo is an electrical device that creates electrical energy from mechanical energy

Working of dynamo:

  1. A dynamo is created by placing a conducting wire between the north and south poles of a permanent magnet.
  2. According to the laws of electromagnetism, when a current-carrying conductor is placed in a changing magnetic field, a current flow is induced inside the conductor.
  3. Therefore, a changing magnetic field is produced by rotating the coil.
  4. According to the laws of electromagnetism, this changing magnetic field induces a current flow inside the coil.
  5. During these rotations, two possible polarities are generated, positive polarity or negative polarity.
  6. We know that for alternating current a positive polarity and a negative polarity must be present.
  7. Hence, this change in the magnetic field generates an alternating current.

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