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Ferrite Bead: Tiny Cylinder in Power Cords & Cable. Why?

Ferrite Bead: Tiny Cylinder in Power Cords & Cable. Why?

Have you ever noticed a little cylinder in a power cords and cable? Have you ever seen the same in your laptop charger cord, USB cord, Mobile charger cable cord, Printer Cord, Monitor cord, etc. even in Mouse and keyboard cable cords? Today, we are going to tell you the secret story behind it.
Ferrite Bead Tiny Cylinder in Power Cords & Cable. Why
Ferrite Bead Tiny Cylinder in Power Cords & Cable. Why
Theoretically, this Tiny Cylinder in Power Cords & Cable is ferrite choke or ferrite bead as shown in the below image.
The ferrite choke is an object in the cylindrical shape, which made up of Ferrite material (which is a magnetic material). A typical Ferrite choke (e.g. Solenoid) consists of an insulated wire around a magnetic material. In our case, cable is insulator and ferrite cylinder is magnetic material to make a special kind of lump for the power cable and cords.Tiny Cylinder in Power Cords & Cable. Ferrite choke and beadFerrite Bead (or Ferrite choke) playing a very important rule. As we know that, when current passes through the conductors (inside the power cords), it produces EMF (Electromotive Force) or Radio Energy. The power cords and cable transfer this energy outside in the form of noise, which disturb and interfere with other electronics devices such as nearby radio sound would be noisy with improper tuning of channel. In addition, some electrical energy is wasted in the form of radiation, which also reduces the supply power to the battery or other connected devices, which leads to increase the charging time of battery.what is the tiny cylinder in power cords and cable usb printer chargerFerrite Bead has the ability to stop and block the emission of radio waves form the power cords and uses electrical energy for charging purpose only without power losses. Due to this important factor, that’s why are there a tiny cylinder in your laptop or mobile charger cords. Now, I think it is enough because you have clear understanding of the purpose of this magical tiny object (ferrite bead or ferrite choke) in the cylindrical shape in power cords and cables.
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  1. Hello, I dont think connecting a ferrite core inductor will stop emissions and all.. Rather, within my knowledge these inductors will stop the noise that get added to main signal/current flowing through the wire. Also ripples in the signals can be removed with these inductors.

    1. You are both correct. A ferrite bead can be used to reduce EMI coming from a cable (emissions) AND to reduce the effect of externally generated EMI on the integrity of the signal in the wire (immunity). If anyone is actually interested in the usage of ferrite beads, wikipedia has a much more complete article. This one is sorely incomplete…

    2. i think the ferrite core inductor acts like a filter to reduce the ripples in the signal , an din this way it also diminish the effect of AC signal and reduces the noise produced by the fields.

  2. Excellent post. I was checking continuously this weblog and I am impressed!

    Extremely helpful information specially the ultimate part 🙂 I
    take care of such information much. I used to be
    seeking this particular information for a long time.
    Thanks and good luck.

  3. I am looking for an blog who can elaborate some basics and major part of electricity.

    And when i am coming on your blog so my searching is end.
    Very nicely you have explained everything.

    Cheers !!

  4. Nice articles about different unknown technical facts in a simple way to understand even for the lay man also.nice articles&I wish to read such articles always coming in fb or any other messages.tnx for the articles.

  5. All wrong. This cylinder is a filter that removes high frequency noise from a signal. In no way it can prevent EM wave propagation in connected wires.

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