We often check what features we have in our laptop or mobile and does it provide any accessories? , How long is the charger? but have you ever notice small, black, cylindrical thick part at the end of the cable's pins. Most people ignore it, but this small part is very important for the safety of your expensive device. This part is called a 'ferrite bead' or 'ferrite choke'.
When current flows through the charger cable, it creates high-frequency waves or electronic noise. This noise or 'electrical noise' can interfere with the signal received by your phone or laptop or damage the circuits in the device.
Function of ferrite beads:
Noise filtering: These ferrite beads work like a filter. They absorb or neutralize these dangerous high-frequency signals. By stopping the noise, the data or charging current received by your device remains stable and pure. This noise causes problems such as device hangs, signal interruptions or charging stops. Ferrite beads protect against all these problems.
Why are ferrite beads not seen these days?
If you don't see this ferrite bead on the charger cable of your new phone or laptop, there is no need to worry. This means that your cable and charger are made of more advanced technology.
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Modern chargers and cable connectors now include internal circuits or technology for 'noise filtering'. This has reduced the need for this external black bead. However, these ferrite beads can still be seen on the cables of large appliances like microwaves or geysers.