Question

What is dynamo?

Answer 1

Dynamos are devices that turn mechanical rotation into electrical energy. A dynamo is an electromagnetically powered device that generates direct current electric power. It's also called a generator, but that name usually refers to an "alternator" that generates alternating current power.

Complete step-by-step solution:
A dynamo is an electrical generator that uses a commutator to generate direct current. Simply put, a gadget that uses electromagnetic energy to generate direct current electric power. It's a DC generator, or an electrical machine that converts mechanical energy into direct current electricity. Many later electric-power conversion devices, such as the alternating-current alternator, the electric motor, and the rotary converter, were built on the basis of dynamos, which were the first electrical generators used to transmit power to industry.
Working of Dynamo:
A simple dynamo is depicted above, with a coil composed of conducting wire sandwiched between the North and South poles of two permanent magnets. When the coil is motionless, no voltage is induced. The magnetic field changes as the coil rotates, causing a voltage to be induced within the coil.
The left side of the coil moves away from the North pole of the left magnet throughout the first half of the revolution. The coil moves from the right magnet's South pole in the second part of the revolution. There are two polarities that can occur during these rotations: positive and negative. Alternating voltage refers to the transition between these polarities.

Note: The dynamo was first used to generate electricity for commercial purposes. The early dynamos, like all later generators, converted mechanical energy (generated by steam, which was produced by burning coal) into electricity. The term is no longer as widely used as it once was, because it refers to generators that produce direct electric current (DC) rather than the more common alternating current (AC).