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電壓是標量,有正負之分,也就是說它有方向,但只有兩個方向,你可以任意指定其中的一個方向為正方向,則另一個為負方向.區分它跟電勢的區別,電勢是矢量,它可以360°朝任何方向.電壓就是電勢的差(電勢差).
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