正常情况下，视在功率是指，容量固定不变，把视在功率看作圆的半径，横轴上投影是有功功率，纵轴上投影是无功功率，夹角就是功率因数角。当夹角为0时，功率因数为1，容量直接等于有功功率，那么当夹角为90°时，是什么情况呢？

The relationship between active power and reactive power

Under normal circumstances, apparent power refers to a situation where the capacity remains constant. Think of apparent power as the radius of a circle, with the projection on the horizontal axis representing active power and the projection on the vertical axis representing reactive power. The angle formed is the power factor angle. When the angle is 0, the power factor is 1, and the capacity is directly equal to the active power. So what happens when the angle is 90°?