ʻO ka manaʻo o ke au uila

I loko o ka electromagnetism, ʻo ka nui o ka uila e hele ana ma kekahi ʻāpana kea o kahi alakaʻi i kēlā me kēia manawa ua kapa ʻia ʻo ka ikaika o kēia manawa, a i ʻole ke au uila wale nō. ʻO ka hōʻailona no ke au ʻo I, a ʻo ke anakahi ʻo ampere (A), a i ʻole "A" wale nō (André-Marie Ampère, 1775-1836, he kanaka loea a he kemika Farani, nāna i hana i nā hoʻokō koʻikoʻi i ke aʻo ʻana i nā hopena electromagnetic a ua hāʻawi pū i nā haʻawina i ka makemakika a me ka physics. ʻO ke anakahi honua o ke au uila, ʻo ampere, ua kapa ʻia ma hope o kona inoa hope).
[1] ʻO ka neʻe mau ʻana o nā uku manuahi i loko o kahi alakaʻi ma lalo o ka hana a ka ikaika o ke kahua uila e hana i kahi au uila.
[2] I ka uila, ua hoʻoholo ʻia ʻo ke kuhikuhi o ke kahe ʻana o nā uku maikaʻi ke kuhikuhi o ke au. Eia kekahi, i ka ʻenekinia, hoʻohana ʻia ke kuhikuhi o ke kahe ʻana o nā uku maikaʻi ma ke ʻano he kuhikuhi o ke au. Hōʻike ʻia ka nui o ke au e ka uku Q e kahe ana ma o ka ʻāpana kea o ke alakaʻi i kēlā me kēia manawa, i kapa ʻia ʻo ka ikaika o ke au.
[3] Nui nā ʻano mea lawe ma ke ʻano e lawe ana i ka uku uila. No ka laʻana: nā electrons neʻe i loko o nā alakaʻi, nā ions i loko o nā electrolytes, nā electrons a me nā ions i loko o ka plasma, a me nā quarks i loko o nā hadrons. ʻO ka neʻe ʻana o kēia mau mea lawe e hana i kahi au uila.