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i want to about working principle of dc motors compare with ac motors with videos........also i need transformers working video............

why twine is used in faradays experiment

Principle of DC motors-DC motor operation is based on simple electromagnetism principle.
In DC motor a current-carrying conductor generates a magnetic field when this is then placed in an external magnetic field it will experience a force proportional to the current in the conductor, and to the strength of the external magnetic field.

Principle of AC motor- electric motor is an electromechanical device that converts electrical energy into mechanical energy.

In AC motor we can reverse field directions without having to use brushes.

what is the charecterstics and application of ac and dc motor

what is principle of ac motor