On which of the following principle an electric generator works?

Question

Question

Answer 1

Concept:

Electromagnetic Induction

When a conductor is kept in changing magnetic field, the electric current is induced in the conductor.
The magnetic field associated with the conductor can be changed by relative motion between magnet and conductor or by changing the magnitude of the magnetic field.
The magnetic field induced in a conductor is given as

\(E = \frac{-dϕ }{dt}\)

ϕ is magnetic flux, ϕ = BA, B is magnetic field and A is area enclosed by the conductor

Explanation:

F1 P.Y Madhu 20.04.20 D2

When A coil is rotated in a magnetic field by magnetic energy, magnetic flux is changed through the coil.
And so, EMF is induced in the coil that produces current. So, Electric energy is generated.

So the correct option is electromagnetic induction.

Important Points

The magnetic field is generated due to the current-carrying conductor. An electromagnet is based on this.
A force acts on a current-carrying conductor in a magnetic field.

Additional Information Difference between AC and DC Generator

SI. No.	Differentiating property	AC Generator	DC Generator
1	Definition	AC generator is a mechanical device which coverts mechanical energy into AC electrical power.	DC generators is a mechanical device which converts mechanical energy into DC electrical power.
2	Direction of current	In an AC generator, the electrical current reverses direction periodically.	In a DC generator, the electrical current flows only in one direction.
3	Basic Design	In an AC generator, the coil through which the current flows is fixed while the magnet moves. The construction is simple and costs are less.	In a DC generator, the coil through which the current flows rotates in a fixed field. The overall design is very simple but construction is complex due commutators and slip rings.
4	Commutators	AC generator does not have commutators.	DC generators have commutators to make the current flow in one direction only.