Ferrite Bead: Why Is There A Tiny Cylinder In Power Cables

Ever noticed the cute little cylinder in cords and cable? Noticed the same in your laptop charger cord, USB cord etc. also in Mouse and keyboard cable cords? Today, we intend to inform you what actually is that small little thing. Well, this little ferrite bead is called a Ferrite Choke.

Ferrite bead

The ferrite choke is a cylindrical mechanism made up of Ferrite material (Magnetic Material).

It consists of an insulated wire which is wound around a magnetic material. Ferrite bead plays a very crucial role in the working of these cables where they are installed. We know that, when an electric current passes through a conductor, like a power chord attached to our mobile phones, it produces EMF also known as Electromotive Force or simply Radio Energy.

Also Read: Why In a Three Pin Plug The Earth Pin is Thicker And Longer Than Other Pins

Power cords radiate this energy outside in the form of noise, this noise has a potential to interfere with other electronic devices such as nearby radio or audio system. Additionally, it also wastes a lot of electrical energy leading to higher power consumption.

Ferrite Bead is designed to stop and block the emission of noise or radio energy from causing harm to other devices. Just because of this there is a tiny cylinder in your laptop or mobile charger cords. A small thing but it has its own relevance in this electronic life.

However, any design that utilizes a ferrite bead to act as a  noise filtering device should take into consideration the specific circuit characteristics and the entire frequency range to block. Different ferrite materials have different properties with respect to frequency, and manufacturer’s literature helps select the most effective material for the frequency range. This point is actually meant to enhance the understanding of the entire concept.

Also Read: Why In a Three Pin Plug The Earth Pin is Thicker And Longer Than Other Pins

IT should be noted that Ferrite beads are one of the simplest and the cheapest types of interference filters to install and use.  In a simple ferrite ring, the wire is simply wound around the core through the center, usually five or seven times. At times a provision of clamp-on cores is also made, which can be attached without wrapping the wire.

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