Question

Explain the working of a dynamo.

Answer 1

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.