Question

How inductor provides constant current source?

Answer 1

An inductor is an energy storage device.. when an AC current is passed through an inductor a magnetic field is produced that can change the condition of the AC current being passed through it...They are used as 'Chokes' in power supplies to filter noise, or switched mode power supplies they are used to build up a magnetic field and then dump the energy into a capacitor by the use of a power transistor switching at high speed (similar to the coil (inductor) in car ignition systems).