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Question on notebook pwr supply cords

Discussion in 'Tech Talk' started by Perrito, Jan 23, 2007.

  1. Perrito

    Perrito Millennium Member

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    What is the little cylindrical looking thing that is on the cord just downstream of the transformer box on notebook power supply cords? In fact many powered electronic device cords have them...what are they called and what do they do?
     
  2. Tennessee Slim

    Tennessee Slim Señor Member CLM

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    It's called a ferrite ring. It's there to reduce the effects of electromagnetic compatibility interference.
     

  3. Perrito

    Perrito Millennium Member

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    Thank you very much. I always wondered what that thing was. Looking around the house I'm noticing alot of devices have that ferrite ring.