Mysterious cylinder at the end of your charger

You may never have thought of the small cylinder on your laptop charger before, but it turns out that it really is very important. This cylinder is known as the ferrite bead and here is what it does.

Why is that so crucial?

Apart from knowing that it powers your laptop, you may not have thought too much about your charger. Until you forget it at home. Then you really think about it. Most days, you plug it in, charge your device, and that's the end.

The cylinder at the end of the string, known as ferrite bead, can do much more.

The ferrite bead is located just before plugging into the computer and suppresses high frequencies of electronic circuits. Ferrite beads are also known as EMI filters, blocks, rings and chokes.

To interrupt nerd speaking, the collar blocks the cable from sending and receiving signals.

Nobody likes mixed signals

As the small parts in your computer run at radio frequencies, the pearl prevents them from interfering with each other. It consists of compounds of ceramics, iron and other metals. Aside from seeing this bead at the end of the charging cable, you can also find it on your mouse, keyboard, and other cables.


The ferrite bead is a type of electro-inductor that releases high-frequency current and serves as the most powerful device for high-frequency noise compression. The cylinder prevents interference between your electronic devices. Let us all give a big thank you to the ferrite bead.

We would be lost without you

If you're still unsure what that means, then you know the cylinder is important and without it, your laptop would be useless,

App Note

Now you can always think of this funny little fact charge your laptop, Even better, if it ever comes on Trivia night, you've covered it up.


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