What is the Principle of electric generator?

An electric generator is a machine used for producing electricity. They convert mechanical energy into electrical energy.

electric generator is an application electro magnetic induction.

Its principle states that:

electric generator works on the principle that when a straight conductor is moved in a magnetic field then the current is induced in the conductor ...

An electric generator works on the principle of Faraday's law of electromagnetic induction. Faraday's law of electromagnetic induction states that "whenever a current carrying conductor are placed in the magnetic field, then a flux is induces in the circuit due to which a current start to flow in the rotor also.