Ferrite bead
Passive component (choke) suppressing high-frequency noise in electronic circuits / From Wikipedia, the free encyclopedia
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A ferrite bead (also known as a ferrite block, ferrite core, ferrite ring, EMI filter, or ferrite choke[1][2]) is a type of choke that suppresses high-frequency electronic noise in electronic circuits.
Ferrite beads employ high-frequency current dissipation in a ferrite ceramic to build high-frequency noise suppression devices.