The ferric cores and ferrites are ceramic tiles with a critalina iron structure with magnetic properties. Filters are used in cable cores inductors, transformers ... to cancel or mitigate the eddy currents.
|Ferric core||Indicator of the direction of flow up and running from left to right|
|Direction indicator and flow down stream from left to right||Iron core with winding|
|Ferric Ceontral with winding
N = turns of the winding
|Two conductors through an iron core and a winding on one core|
|Ferric core with three windings||Ferrite on a wire|
|Ferrite on a wire|