Question

Modern electrical generator works on _______ principle.
1. Magnetic Induction
2. Electromagnetic Induction
3. Electrical Induction
4. Electrical Energy

Answer 1

Correct Answer - Option 2 : Electromagnetic Induction

The correct answer is Electromagnetic Induction.

• The modern electrical generator works on the Electromagnetic Induction principle. 

• Faraday’s first law of electromagnetic induction states that whenever a conductor is placed in a varying magnetic field, emf is induced which is called induced emf. If the conductor circuit is closed, the current will also circulate through the circuit and this current is called induced current.
• Faraday's second law of electromagnetic induction states that the magnitude of emf induced in the coil is equal to the rate of change of flux that linkages with the coil. The flux linkage of the coil is the product of a number of turns in the coil and flux associated with the coil.

• Electric generator function-
  • ​An Electric generator works on the principle of Faraday's law of Electromagnetic Induction.
  • An electric generator uses mechanical energy to generate electricity applying Faraday's law of induction.
  • It spins a coil at a constant rate in a magnetic field to induce an oscillating emf.
  • A conductor coil (a copper coil tightly wound onto a metal core) is rotated rapidly between the poles of a horseshoe-type magnet. The conductor coil along with its core is known as an armature.
  • The armature is connected to a shaft of a mechanical energy source such as a motor and rotated.
  • The mechanical energy required can be provided by engines operating on fuels such as diesel, petrol, natural gas, etc., or via renewable energy sources.
  • When the coil rotates, it cuts the magnetic field which lies between the two poles of the magnet.
  • The magnetic field will interfere with the electrons in the conductor to induce a flow of electric current inside it.