A cikin labarin game da lissafin lissafin an tattauna a taron wutar lantarki, haka kuma filin lantarki An yi bayani a cikin labarin game da filayen lantarki. Filayen lantarki da kwararar wutar lantarki suna wanzuwa a cikin na'urar jagora idan akwai bambancin yuwuwar a kan mai jagoranci, akasin haka, idan babu wani bambanci mai yuwuwa to babu filin lantarki da wutar lantarki.
A cikin na'urar sarrafa ƙarfe, filin lantarki yana daidai gwargwado kai tsaye da yawan wutar lantarki, inda rabon filin lantarki zuwa yawan wutar lantarki yake daidai. Ana kiran rabon filin lantarki zuwa yawan wutar lantarki. juriya ko nau'in juriyaA lissafi, an bayyana dangantakar da ke tsakanin filin lantarki, yawan wutar lantarki da juriya a cikin lissafin:
Bayani: ρ = takamaiman juriya, E = filin lantarki, J = yawan wutar lantarki
Ɗaya daga cikin dabarun filin lantarki shine E = V/s inda V = bambancin yuwuwar lantarki = ƙarfin lantarki da s = nisa, don haka naúrar filin lantarki shine Volt/mita (V/m). Tsarin yawan yanzu shine J = I/A inda I = wutar lantarki da A = yankin giciye na jagorar, don haka naúrar yawan yanzu shine murabba'in Ampere/mita (A/m)2). Tsarin juriya shine ρ = E/J don haka naúrar takamaiman juriya ita ce V/m : A/m2 = V/m x m2/A = V/A (m) = Ω m (karanta: mitar Ohm). Ω = Volt/Ampere naúrar juriya ce ta lantarki, an yi bayanin wannan naúrar a cikin labarin game da Dokar Ohm.
Ci juriya Mafi girman darajar mallakar masu hana wutar lantarki ne ko kuma masu sarrafa wutar lantarki marasa kyau, yayin da ƙimar juriya Mafi ƙanƙanta mallakar ƙwararren mai sarrafa wutar lantarki ne ko kuma mai sarrafa wutar lantarki. Mafi kyawun mai sarrafa wutar lantarki, mafi ƙanƙanta juriya jagoran. Tsarin masu sarrafa ƙarfe waɗanda ke da juriya Daga babba zuwa ƙarami akwai tin, ƙarfe, aluminum, zinariya, jan ƙarfe, da azurfa. Don haka za a iya kammala da cewa ƙimar ita ce. juriya abu yana bayyana girman ikon abin na hana wutar lantarki.
Mai jagoranci mai kyau wanda ke bin dokar Ohm, a wani yanayi mai zafi, ƙimar juriyarsa ba ta dogara da filin lantarki ba, ma'ana idan girman filin lantarki ya canza, ƙimar juriya ba ta canzawa. Akasin haka, mai jagoranci wanda bai bi dokar Ohm ba, ƙimar juriyarsa ta dogara ne akan filin lantarki, ma'ana idan girman filin lantarki ya canza, ƙimar juriyarsa ma ta canza.
Juriyar na'urar sarrafa ƙarfe ta dogara ne da zafin jiki. Yayin da zafin jiki ke ƙaruwa, juriyar tana ƙaruwa; akasin haka, yayin da zafin jiki ke raguwa, juriyar tana raguwa. Yayin da zafin jiki ke ƙaruwa, ƙwayoyin halitta suna motsawa da sauri kuma suna zama marasa tsari, suna hana motsin electrons, suna rage guduwarsu. Yayin da zafin jiki ke raguwa, ƙwayoyin halitta suna motsawa a hankali kuma suna zama masu tsari, wanda ke ba da damar kwararar electrons mai santsi.
Juyin juriya shine juyi. A lissafi, dangantakar da ke tsakanin juriya da juyi ana bayyana ta ta hanyar lissafi:
σ = 1/ρ
Bayani: σ = ƙarfin lantarki, ρ = juriyar direba.
Naúrar juriya ita ce Ωm don haka naúrar watsawa ita ce 1/Ωm = (Ωm)-1
Masu sarrafa wutar lantarki ko masu sarrafa wutar lantarki masu kyau suna da mafi girman ƙimar wutar lantarki yayin da mafi ƙarancin ƙimar wutar lantarki suna da masu hana wutar lantarki ko masu sarrafa wutar lantarki marasa kyau. Mafi kyawun mai sarrafa wutar lantarki yana gudanar da wutar lantarki, haka nan mafi girman ƙarfin wutar lantarki yake. Tsarin masu sarrafa ƙarfe waɗanda ke da mafi girma zuwa mafi ƙanƙantar ƙarfin lantarki shine azurfa, jan ƙarfe, zinariya, aluminum, ƙarfe, tin. Don haka za a iya kammala da cewa ƙimar wutar lantarki na wani abu yana nuna ma'aunin ikon abin na'urar lantarki. Azurfa tana da babban ƙarfin lantarki amma tana da tsada don haka ana amfani da jan ƙarfe sosai a matsayin mai sarrafa wutar lantarki.
