Extended data
1, reactive power.
Reactors (inductors or capacitors) in AC circuits generate reactive power. Because there is a 90-degree phase difference between the voltage at both ends of the reactor and the current flowing through it, it cannot do work and does not consume active power, but it participates in the energy exchange with the power supply, generates reactive power, and reduces the power supply efficiency of the generator and the power grid.
2. Power factor.
In the power triangle, the ratio of active power P to apparent power S is called power factor cosφ, and the calculation formula is: P=U×Icosφ, where φ refers to the phase difference between voltage and current. In the operation of power grid, the power factor reflects the degree to which the apparent power output by power supply is effectively utilized. We hope that the greater the power factor, the better. In this way, the reactive power in the circuit can be minimized, and most of the apparent power will be used to supply active power, thus improving the power of power transmission.
3. Active power.
In AC circuit, active power refers to the integral average of instantaneous power (or power consumed by load resistance) emitted or consumed by load in a cycle, so it is also called average power.