polarity reversed

基本解释

LED will not "light" if polarity is reversed.
LED将不是“轻”如果极性逆转。
If the current source contacts are non-ohmic, there may be a significant difference in the compliance voltage when the source polarity is reversed.
如果电流源接点有非欧姆接触特性，那么当源的极性反向时，其输入端压降就可能会有很大的不同。
Viewed from inside the tube, this field looks like an accelerating electrical pulse, and it is this pulse that picks up and carries the electrons—or, if the polarity is reversed, the protons.
从腔内看，此电场就如同一个加速电流脉冲，该脉冲可选中并携带电子，或在极性逆转时选中并携带质子。