What is called Residual Magnetism ?

Residual Magnetism

Residual magnetism is defined as the amount of magnetization left behind after the outside magnetic field has been removed from the circuit.

It is the property of a ferromagnetic material which is due to hysteresis of the material in the core.

Why it is important ?

It is important for because it helps in starting of motors and building of speed.

What is KVA ?