Principles of electrical power control

Abstract

The term power theory of circuits can be understood as the state of knowledge on their power properties. In that sense it is a set of true statements, interpretations, definitions and equations describing these properties. The theory of power, understood that way, is a collective product of those who seek an answer to the question why a load with the active power P usually demands a power source with an apparent power S greater than its active power. This question is closely related to the need for interpretation of power phenomena in electric circuits. Another factor is of a practical nature - power theory attempts to answer the question how the apparent power of the source can be reduced without the reduction in the load active power.