Hauv electromagnetism, tus nqi hluav taws xob uas dhau los ntawm ib qho kev hla ntawm tus neeg xyuas pib hauv ib lub sij hawm hu ua tam sim no siv, lossis tsuas yog hluav taws xob tam sim no. Lub cim rau tam sim no yog kuv, thiab chav tsev yog ampere (A), lossis yooj yim "A" (André-Marie Ampère, 1775-1836, Fabkis lub cev ...
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