What is a Choke ?

A choke is an inductor which is used to block AC voltages from a circuit.  Thus, it "chokes off" the AC currents. 
Chokes usually have fixed values.
Chokes can be classified into
  • Audio Frequency chokes which function at the power and audio frequency and
  • Radio Frequency chokes which function at the
Audio frequency chokes  have toroidal cores made of ferrite material. 
Radio frequency chokes have iron powder or ferrite materials.

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