Which of the following is NOT a component of EMI?

Shielding effectiveness is a measurement that assesses how well a shielding material can protect against electromagnetic interference (EMI). It refers to the ability of a barrier, such as a foil or a mesh, to block or attenuate electromagnetic signals from external sources, thereby safeguarding the integrity of the signals in cables and equipment. While shielding effectiveness is a critical aspect of managing EMI in telecommunications and power systems, it is not a component of EMI itself.

In contrast, unbalanced electromagnetic fields of the power system, coupling between power and telecommunications, and susceptibility of the telecom system are all integral elements regarding how EMI manifests and impacts systems. These components help to describe the interactions and vulnerabilities that can occur when power systems generate electromagnetic fields that may interfere with telecommunications equipment.