Have you ever wondered what this small cylindrical thing or device at the end of your Laptop charger is? Many of you may don’t know what it is and why it is fixed?

You think it is useless knowing the reason of its use. But computer geeks and technology freaks must have to know and it is really important.

This cylindrical device is known as a Ferrite Bead. It is an inductor (passive electric component) that suppresses high-frequency noise in electronic circuits.

This ferrite bead isolates laptops from electromagnetic noise, either from the waves picked up by the wire or from the existing noise in the AC-DC converter or the AC line.

This device employs the excess of high-frequency currents in a ferrite ceramic and helps build high-frequency noise suppression devices. This bead isn’t that necessary all the time, but its inclusion helps laptop pass FCC tests.