Application of Electromagnetism

Electromagnetic induction (or sometimes just induction) is a process where a conductor placed in a changing magnetic field (or a conductor moving through a stationary magnetic field) causes the production of a voltage across the conductor. This process of electromagnetic induction, in turn, causes an electrical current - it is said to induce the current.
Electromagnetic induction is an incredibly useful phenomenon with a wide variety of applications. Induction is used in power generation and power transmission, and it's worth taking a look at how that's done

An electric generator

A commercial-type diesel generator

An electric motor is a device for transforming electrical energy into mechanical energy; an electric generator does the reverse, using mechanical energy to generate electricity. At the heart of both motors and generators is a wire coil in a magnetic field. In fact, the same device can be used as a motor or a generator.

AC and DC Generator
Both AC and DC generators produce currents via electromagnetic induction.

Alternating Current Generator

A Slip Ring (has no splits in it) is found in a Alternating Current Generator.

Its purpose is to allow for electrical contact with the brushes.
Current direction in the circuit is being changed by the up and down movement of the loops.
Each loop is always connected to the same brush.

Direct Current Generator

A split-ring can be found in a direct current generator.

The split ring is a movable device used for reversing the polarity of the current. It is made of copper.
The ring divides from the centre into two halves.
The combination of the split ring and brushes is known as the commutator.
The split ring uses in DC generator for getting the pulsating input voltage.