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What this small cylinder on your laptop charger is for

You may have noticed this small cylinder on your laptop charger but have you ever thought what is it for? Or what is it actually? Here we are to tell you a very important purpose of this not-so-important looking part of your charger,

This small cylinder is called Ferrite Bead. It is an electric choke basically and functions to isolate the laptop from electro-magnetic noise which arises out of the waves picked up by the cable, or from the noise in AC-DC converter.

It drive away high-frequency currents in a ferrite ceramic, and helps make the most powerful noise suppression device. It is also known as EMI ring.

It is important because in its absence a circuit is very much likely to break down.