Q:

What is a ferrite bead?

A:

Quick Answer

Ferrite beads are cylindrical bumps located near the plug end of electrical cables, especially those attached to computer products or accessories. They are designed to reduce interference from electromagnetic radiation, especially electromagnetic signals in the radio frequency range.

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Full Answer

Interference from electromagnetic radiation can hamper the performance of devices. The bead protects the device from interference by preventing the cable from receiving or transmitting electromagnetic signals. When the bead picks up an electromagnetic signal, it transforms the energy into heat. This is partially because of the geometry of the bead, and partially because it is made up of ferrite, a magnetic material that increases impedance for higher-frequency signals. This blocks electromagnetic noise from reaching the device and prevents the device from transmitting noise to other objects in the area.

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