All laptop and any kind of mobile charger got a small round and elongated, cylindrical-shaped device. Do you know, what is that device for? 
Most of the people regard them as useless thing, but computer enthusiasts and technology experts says that ‘It is very important part’ .Small-Cylindrical-thing-on-a-laptop-charger-2
That cylinder-shaped device in the top of the charger is called as ‘Ferrite Bead’, which is a kind of ‘Inductor’, that sabotage the high frequency noise.
Small-Cylinee
This means, it secure a laptop by distinguishing sensitive part of laptop from disorders came through AC power lines.
The devices is placed with ‘ferrite ceramics’. This is the same chemical substance, which is used to make coffee cups. It capture the disorders generated by electrical wave and transmits only needed wave for laptop. It is called as ‘EMI filters’ in electronic language.
Now, you can proudly say the importance of small cylindrical shape device .to the people who thinks that this is useless by saying them that this safeguard the laptop.
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