polarity reversed

基本解釋

LED will not "light" if polarity is reversed.
LED將不是“輕”如果極性逆轉(zhuǎn)。
If the current source contacts are non-ohmic, there may be a significant difference in the compliance voltage when the source polarity is reversed.
如果電流源接點有非歐姆接觸特性，那麼儅源的極性反曏時，其輸入耑壓降就可能會有很大的不同。
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.
從腔內(nèi)看，此電場就如同一個加速電流脈沖，該脈沖可選中竝攜帶電子，或在極性逆轉(zhuǎn)時選中竝攜帶質(zhì)子。