"Real power" not the only useful form of electrical power? Reactive power has been associated with "imaginary current" and "magnetizing power". From my understanding, this power would tend to move at right angles to the flow electrical charges. In a system that is powered by a battery, continued operation depends on the voltage difference that remaining just after the "dam has been broken" by the closing of the electrical circuit. The growth of the magnetic field depends on the coil properties and the flow of charges in that coil. If current and voltage were 90 degrees out of phase of each other, no power would be transmitted through the wire, but there may still be signficant reactive power. There would still be a flow of charges, so there would still be a changing magnetic field, though it would have to flip signs. Does the reactive power consume true power? If so, you would expect reactive power to increase in great proportion to the true power. But there are obviously many other variables. I believe there are systems are meant to run off a changing magnetic field. The changing magnetic field is due to a variable reactive power, right? Does a varying "reactive power" mathematically require "real power"? In other words, can we have a changing magnetic field when power factor is 0? Is it the case that battery powered devices deplete according only to the "real power" and that how they are depleted has nothing to do with the "reactive power" that may exist within the same circuit?