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在工农业生产和人民生活中,大量使用的电动机、变压器、电磁铁、感应加热器等感性设备,都是根据电磁感应原理进行工作、依靠磁场来传递和转换能量的。通过交变磁场,电动机才能转动;变压器才能改变电压进行电磁能量的传递。磁场所具有的能量由电源来供给,并随着电流的变化与电源不断地、连续地进行着能量交换。这种能量交换的速率,就是我们要讨论的无功功率。
In the industrial and agricultural production and people’s lives, extensive use of motor, transformer, electromagnet, induction heaters and other perceptual devices, are based on the principle of electromagnetic induction to work, rely on the magnetic field to transfer and convert energy. By alternating magnetic field, the motor can rotate; the transformer can change the voltage for electromagnetic energy transfer. The magnetic field has the energy from the power supply, and with the current changes with the power continuously, continuously with the energy exchange. The rate at which this energy is exchanged is the reactive power we are discussing.