電壓
電壓，所以推電荷而生電流者也。其符號曰V。其強弱以伏特計。電壓有二，一曰電動勢，二曰電勢差。電動勢謂電池所加電勢於電荷也，其猶人之汲水至高處而水得其勢能也。以能量言之，則謂電勢能之增除以電荷之數也。電勢差謂電勢之降也，其猶水自高處趨下而失其勢能也。以能量言之，則謂電勢能之減損除以電荷之數也。 加於一物之電壓與電流之比率有常，此之謂歐姆定律。
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