Choke coil is a part which is used in electrical circuits.
It allows DC current to flow and blocks AC current from passing.
It consists of a coil of insulated wire which is wound on a magnetic core.
It has low resistance which allows both the current to pass with little power loss but it can limit the amount of alternate current due to its reactance.
It works because it can act as an inductor.
When a current is passed it changes AC current which creates a magnetic field in the coil which works against that current.
This is the inductance by which AC currents are blocked.
Now, current results which do not change such as DC current and can continue passing through.
Final Answer:
The choke coil works because it can act as an inductor.
When a current is passed it changes AC current which creates a magnetic field in the coil which works against that current.
This is the inductance by which AC current is blocked.
Now, current results which do not change such as DC current and can continue passing through.