How is "electromagnetism" best defined?

Electromagnetism is best defined as the interaction of electric currents and magnetic fields. This encompasses how electric charges create electric fields, and how these fields can, in turn, affect charges and create magnetic fields. The foundation of electromagnetism lies in Maxwell's equations, which describe how electric and magnetic fields are generated and altered by each other and by charges and currents.

This definition is significant because it highlights the fundamental relationship between electricity and magnetism, which are two aspects of a single physical phenomenon that governs a wide range of applications in technology and engineering, such as motors, generators, and electromagnetic waves. Understanding this interaction is crucial for anyone involved in electrical engineering or related fields, including construction electricians, as it forms the basis for designing and working with electrical systems effectively.