What's the use of the cylinder on some signal cable?

If you look on the cable that connects tour monitor to your PC there is a cylinder. The same cylinder appears on some cable from the power supply of the laptops. What's it called and what's its purpose?


Answers:    That cylinder is call an RF Choke. Radio Frequency Choke. It is used to suppress or keep out radio frequencies from your equipment. If radio frequencies attain into equipment it can produce unwanted interference in your power supply or speaker systems. Some forms of interference include FM and AM radio, Ham Radio, CB Radio and other walkie talkie types.
The simple RF Choke is nothing more than a rope wrapped around a ferrite core. The wire wrapping act as a stopping point for those stray frequencies that hit your wires.
That's what the cylinder is and what its for.
I could be wrong but I'm thinking that may be a surge protector to keep power from put a bet on feeding but close to I'm said I'm not an expert

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