A negative resistance is not a component of the real circuit, but it can be realized by using other circuitcomponents.
负电阻不是实际存在的电路器件，但它可以通过其它的电路元件来实现。
2
The so-called iron-core inductor, inductance refers to media for the electrical circuitcomponents of soft iron, steel and other iron core inductor coil media.
所谓铁心电感，泛指电感元件磁路介质为电工软铁、硅钢片等铁心介质的电感线圈。
3
From starting-up to stabilization of the arc, the electric current and voltage usually fluctuate acutely, which makes a great impact on other circuitcomponents.