【Daily Topic】【Electrical Edition 20160722】
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Participation reward: 2 Wealth. Reward for correct answer: 9 Wealth. Question: What is reactive power?
Reactive power is generated by reactors (inductors or capacitors) in AC circuits. Due to the 90-degree phase difference between the voltage across them and the current flowing through them, they are unable to do work nor consume active power; however, they are involved in energy exchange with the power source, which results in the generation of reactive power and reduces the efficiency of power supply by generators and the power grid.
Reactive power is a rather abstract concept; it refers to the exchange of electric and magnetic fields within a circuit, and it is the electrical power used to create and maintain magnetic fields in electrical devices. It does not do work on the outside world, but instead converts into other forms of energy. Any electrical device equipped with an electromagnetic coil consumes reactive power in order to generate a magnetic field.
Reactive power is generated by reactors (inductors or capacitors) in AC circuits. Due to the 90-degree phase difference between the voltage across them and the current flowing through them, they are unable to do work nor consume active power; however, they are involved in energy exchange with the power source, which results in the generation of reactive power and reduces the efficiency of power supply by generators and the power grid.
The electrical power required to generate an alternating magnetic field and induced magnetic flux is called reactive power
The electrical power required to generate an alternating magnetic field and induced magnetic flux is called reactive power. Therefore, the so-called \"reactive\" power is not \"useless\" power; it simply does not get converted into mechanical or thermal energy； Therefore, in power supply and consumption systems, in addition to active power sources, reactive power sources are also necessary; neither can be omitted. The unit of reactive power is var.
Total power minus useful power equals useless power
Reactive power is generated by reactors (inductors or capacitors) in AC circuits. Due to the 90-degree phase difference between the voltage across them and the current flowing through them, they are unable to do work nor consume active power; however, they are involved in energy exchange with the power source, which results in the generation of reactive power and reduces the efficiency of power supply by generators and the power grid.
Reactive power: Many electrical devices operate on the principle of electromagnetic induction, such as distribution transformers and motors; they rely on the creation of alternating magnetic fields to enable the conversion and transfer of energy. The electrical power required to generate an alternating magnetic field and induced magnetic flux is called reactive power. Therefore, the so-called \"reactive\" power is not \"useless\" power; it simply does not get converted into mechanical or thermal energy ； Therefore, in power supply and consumption systems, in addition to active power sources, reactive power sources are also necessary; neither can be omitted. The unit of reactive power is var.
Power: Many electrical devices operate on the principle of electromagnetic induction, such as distribution transformers and electric motors; they rely on the creation of alternating magnetic fields to enable the conversion and transfer of energy. The electrical power required to generate an alternating magnetic field and induced magnetic flux is called reactive power. Therefore, the so-called \"reactive\" power is not \"useless\" power; it simply does not get converted into mechanical or thermal energy ； Therefore, in power supply and consumption systems, in addition to active power sources, reactive power sources are also necessary; neither can be omitted. The unit of reactive power is var.