I ka electromagnetism, ua kapa ʻia ka nui o ka uila e hele ana ma nā ʻāpana keʻa o kahi conductor i kēlā me kēia manawa i kapa ʻia ʻo ka ikaika o kēia manawa, a i ʻole ka uila uila. ʻO ka hōʻailona no kēia manawa ʻo I, a ʻo ka ʻāpana he ampere (A), a i ʻole "A" wale nō (André-Marie Ampère, 1775-1836, French phys...
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