There's not much physics in the phase angle.

在计算相位角时,用不到多少物理知识。

What is this business of this phase angle?

这个相位角，是什么呢？

It has a magnitude as well as phase Angle.

感抗不但有幅值，而且有相角，它是一个复数量。

It has a magnitude as well as phase Angle. It is a complex quantity.

感抗不但有幅值，而且有相角，它是一个复数量。

And then here we have what we call the phase Angle, and I will return to that.

那么这样，就有相位角，我会回过去讲它。