Concept of reactive power Power in an electric circuit is the rate of flow of energy past a given point of the circuit.In alternating current circuits,energy storage elements such as inductance and capacitance may result in periodic reversals of the direction of energy flow. 口 The portion of power that,averaged over a complete cycle of the AC waveform,results in net transfer of energy in one direction is known as real power. The portion of power due to stored energy,which returns to the source in each cycle,is known as reactive power. 电力拿镜广城洲量写控制四川省童点实验蜜 家电网电力系统广域测量与控制四川省重点实验室 Concept of reactive power  Power in an electric circuit is the rate of flow of energy past a given point of the circuit. In alternating current circuits, energy storage elements such as inductance and capacitance may result in periodic reversals of the direction of energy flow.  The portion of power that, averaged over a complete cycle of the AC waveform, results in net transfer of energy in one direction is known as real power.  The portion of power due to stored energy, which returns to the source in each cycle, is known as reactive power