Te ariā o te iahiko hiko

I roto i te aukumetanga hiko, ko te nui o te hiko e tika ana mā roto i tētahi wāhanga whakawhiti o tētahi kaiārahi ia wā ka kiia ko te kaha o te au, ko te au hiko noa iho rānei. Ko te tohu mō te au ko I, ā, ko te waeine ko te ampere (A), ko te "A" noa iho rānei (André-Marie Ampère, 1775-1836, he tohunga ahupūngao me te matū Wīwī, nāna i whakatutuki ngā whakatutukitanga nui i roto i te ako i ngā pānga aukumetanga, ā, i whai wāhi atu hoki ki te pāngarau me te ahupūngao. Ko te waeine ā-ao mō te au hiko, ko te ampere, i tapaina i muri i tōna ingoa whānau).
[1] Ko te nekehanga auau o ngā utu kore utu i roto i te kaiārahi i raro i te mahi a te kaha o te papa hiko ka hanga he iahiko hiko.
[2] I roto i te hiko, e whakatauhia ana ko te ahunga o te rere o ngā utu pai ko te ahunga o te ia. Hei tāpiri, i roto i te hangarau, ka whakamahia hoki te ahunga rere o ngā utu pai hei ahunga o te ia. Ko te rahi o te ia e whakaatuhia ana e te utu Q e rere ana i roto i te wāhanga whakawhiti o te kaiārahi ia wā, e kiia nei ko te kaha o te ia.
[3] He maha ngā momo kaikawe i roto i te taiao e kawe ana i te utu hiko. Hei tauira: ngā irahiko nekeneke i roto i ngā kaiārahi, ngā iona i roto i ngā irahiko, ngā irahiko me ngā iona i roto i te parāuma, me ngā kuaraka i roto i ngā hadrona. Mā te nekehanga o ēnei kaikawe ka puta he iahiko hiko.