歐姆定律
歐姆定律，電學之法也。其式曰：「V=IR」，V為電壓，I為電流，R為電阻。其言若温不變、物之形質不變者，則電壓與電流之率有常，其率曰電阻。
物之電阻因質、長短、粗幼而異。其式曰：「R=pL/A」，p為電阻率，其數因物質而異。L為物之長短，A為橫截面長、廣之積。
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