安培者,所以言電流之大小也。略云安,符號曰A。其定義曰:
今有二平行電線在真空,相去一米,而其相引之力為二乘十之負七次方牛頓者,則電線各有一安培之電流也。
安培以外,亦有以毫安、微安計電流者。一安培為一千毫安,一毫安為一千微安。
安培之名,出於安德烈馬里安培。斯人籍在法國,善數學,通物理。後世以安培為名者,追思其電磁學之功也。
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