Ferrite core on the power cable: That is its purpose

There is often a cylinder on the power cable, which contains a ferrite core. The purpose of this core is as simple as it is important. We explain what the small cylinder on the power cable is for.

Ferrite core on the charging cable prevents interference

Most charging cables, for example for laptops, end up with a plastic cylinder that contains a ferrite core.

• Devices such as notebooks generate electromagnetic waves during operation.
• The charging cable transmits these waves, much like a radio antenna.
• This can interfere with other electronic devices. For example, the waves can affect WLAN reception.
• The ferrite core acts as an interference filter, which cancels the electromagnetic waves before they can be emitted via the cable.
• Ferrite is a non-electrically conductive material that absorbs electromagnetic waves as they pass through.