Minor power factor refers to the amount of reactive power present in an electrical system. Reactive power is the power that is not used to do actual work but rather is used to create and maintain an electromagnetic field. Synonyms for minor power factor include reactive power, imaginary power, and non-working (or non-productive) power. These terms all refer to the same concept of power in an electrical system that is not used to do physical work but is still required to maintain the system's functionality. Being able to understand and evaluate the level of minor power factor in an electrical system is crucial for efficient energy consumption and maintenance of equipment.