What type of current is considered objectionable and introduces electromagnetic interference in electronic equipment?

The term "objectionable current" refers specifically to the type of electrical current that can cause unwanted effects, such as electromagnetic interference (EMI), in electronic equipment. This interference can disrupt the normal operation of sensitive devices, leading to malfunctions, data loss, or degraded performance.

Objectionable current is often a result of ground faults, stray currents, or imbalances in the electrical system, causing fluctuations that can radiate electromagnetic energy, affecting nearby electronics. This is particularly noteworthy in environments with high technology use, where such interference can lead to significant operational issues.

The other types of current listed do not explicitly relate to electromagnetic interference in the same manner. Apparent current is a term more focused on the combined effect of active and reactive currents in an AC circuit, while impedance current and residual current have specific definitions that do not emphasize the produced interference in electronics as a primary concern. Therefore, the choice of objectionable current is accurate, as it directly addresses the issue of EMI in electronic systems.