A dynamo is a type of electrical generator that is used to create a conducting current with the help of a commutator.
A dynamo used the laws of electromagnetism to create a direct conducting current or electric power from the rotation of the coil.
Hence, a dynamo is an electrical device that creates electrical energy from mechanical energy
Working of dynamo:
A dynamo is created by placing a conducting wire between the north and south poles of a permanent magnet.
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.
Therefore, a changing magnetic field is produced by rotating the coil.
According to the laws of electromagnetism, this changing magnetic field induces a current flow inside the coil.
During these rotations, two possible polarities are generated, positive polarity or negative polarity.
We know that for alternating current a positive polarity and a negative polarity must be present.
Hence, this change in the magnetic field generates an alternating current.