I have no idea what these things are called so I don't know what terms to search on to research them.
Anyway, it looks like a metal donut that a paired set of wires wrap around and through multiple times.
Questions:
Thanks
-Marcus
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1) ferrite bead 2) Its an inductor. Blocks hi frequencies, passes lo frequenciesAlso could be a transformer.
Depending on how they are wired.
"BobG" wrote
Or a transformer.
It can also be called a _core_ for a toroid inductor, or a core for a transformer, if more than one winding is used.
An information page for beginners about beads, toroid cores, transformer cores, scroll down to see pictures:
This is one of the most known makers of toroid cores
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