Formula Palekana Uila
Ma ka ʻatikala e pili ana i ke kānāwai o Ohm, ua loaʻa kahi haʻilula e hōʻike ana i ka pilina ma waena o ke ana uila (V), ke au uila (I) a me ke kū'ē uila (R). Ma ke ʻano makemakika, ua hōʻike ʻia ma o ka hoohalike:
Hōʻike kēia kaulike he kūlike pololei ke kū'ē uila (R) me ke ana uila (V) a kūlike hoʻi me ke au uila (I). ʻO ka nui o ke ana uila, ʻo ka nui o ke kū'ē. I ka ʻaoʻao ʻē aʻe, ʻo ka nui o ke au uila, ʻo ka nui o ke kū'ē. Wehewehe kēia kaulike i ke kānāwai o Ohm ke paʻa mau ke kū'ē (R). Inā ʻaʻole paʻa ke kū'ē, ʻaʻole wehewehe kēia kaulike i ke kānāwai o Ohm akā wehewehe i ke kū'ē o kahi alakaʻi.
Ma ka ʻatikala i kapa ʻia ʻo Ohm's Law, ua wehewehe pū ʻia ka pilina ma waena o ke kū'ē ʻana o ke alakaʻi (R), ke kū'ē ʻana o ke alakaʻi (ρ), ka lōʻihi o ke alakaʻi (l) a me ka ʻāpana ʻāpana o ke alakaʻi (A) . Ma ke ʻano makemakika, ua hōʻike ʻia ma ka hoohalike:
Ma muli o kēia kaulike, ua hoʻoholo ʻia he kūlike pololei ke kūʻē ʻana i ke kūʻē kikoʻī a me ka lōʻihi o ke alakaʻi, akā kūlike ʻole i ka ʻāpana ʻāpana o ke alakaʻi. I nā huaʻōlelo ʻē aʻe, piʻi ke kūʻē ʻana i ka piʻi ʻana o ke kūʻē kikoʻī a/a i ʻole ka lōʻihi o ke alakaʻi. E emi ana ke kūʻē ʻana i ka piʻi ʻana o ka ʻāpana ʻāpana o ke alakaʻi.
Inā paʻa ka lōʻihi o ke alakaʻi (l) a me ka ʻāpana ʻāpana (A), a laila hilinaʻi wale ke kūʻē (R) i ka resistivity (ρ). I ka piʻi ʻana o ka resistivity, piʻi ka kūʻē. I ka emi ʻana o ka resistivity, emi ka kūʻē uila. Pili pono ka waiwai resistivity o kēlā me kēia alakaʻi i ka mahana. Inā kiʻekiʻe ka mahana, piʻi ka resistivity, a i ʻole ka ʻaoʻao ʻē aʻe, inā haʻahaʻa ka mahana, emi ka resistivity.
Ka hoʻokele ʻana
ʻO ke ʻano ʻē o ka resistivity ʻo ia ka conductivity. He kūlike ʻole ka conductivity me ka resistivity, e like me ka mea i hōʻike ʻia ma ka hoohalike ma lalo nei:
Inā hōʻike ʻia ma ke ʻano o ka conductivity a laila loli ka hoohalike 2 i:
Ma muli o kēia kaulike, ua hoʻoholo ʻia he kūlike ʻole ke kūʻē uila me ka conductivity, inā ʻoi aku ka nui o ka conductivity o ke alakaʻi, ʻoi aku ka liʻiliʻi o ke kūʻē, a i ʻole ka ʻaoʻao ʻē aʻe, inā ʻoi aku ka liʻiliʻi o ka conductivity o ke alakaʻi, ʻoi aku ka nui o ke kūʻē.
Ua hōʻike ʻia nā waiwai resistivity o kēlā me kēia mea ma ka papa ma lalo nei.
ʻĀpana
ʻO ke anakahi o ke anakahi uila ʻo Volt, ʻo ke anakahi o ke au uila ʻo Ampere, no laila ʻo ke anakahi o ke kū'ē ʻana ʻo Volt/Ampere. Ua kapa ʻia ʻo Volt/Ampere ʻo Ohm, i hōʻailona ʻia e Ω, e hoʻohanohano ana iā Georg Simon Ohm (1789-1854), he kanaka loea kino Kelemania. Ma waho aʻe o Ohm, hoʻohana pū ʻia nā anakahi kiloohm a me megaohm. 1 kiloohm (kΩ) = 1000 Ω = 103 Ω , ʻoiai ʻo 1 megaohm (MΩ) = 1000.000 Ω = 106 Ω.
Mea ana
ʻO ka mea hana i hoʻohana ʻia no ke ana ʻana i ke kū'ē uila he ohmmeter. Ua hoʻohui ʻia kēia mea ana i loko o kahi multimeter, kahi mea hana no ke ana ʻana i ka voltage, ke au, a me ke kū'ē. Ua kūkākūkā hohonu ʻia nā Ohmmeters ma ka ʻatikala e pili ana i nā mea ana uila.
