Labari game da juriya
Dangane da wutar lantarki, an tattauna yawan wutar lantarki, haka nan kuma an yi bayani game da filin lantarki a cikin batu game da filin lantarki. Filin lantarki da wutar lantarki suna cikin mai jagora idan akwai bambanci mai yuwuwa a cikin mai jagora, yayin da idan babu bambanci mai yuwuwa, to babu filin lantarki da wutar lantarki.
A kusan dukkan masu sarrafa ƙarfe, filin lantarki yana daidai gwargwado kai tsaye da yawan wutar lantarki, inda rabon filin lantarki da yawan wutar lantarki yake dawwama. Darajar kwatancen filin lantarki da yawan wutar lantarki ana kiransa da juriya. A lissafi, an bayyana alaƙar da ke tsakanin filin lantarki, yawan wutar lantarki, da juriya a cikin lissafi:
ρ = E / J
ρ = juriya, E = filin lantarki , J = yawan wutar lantarki
Ɗaya daga cikin dabarun filin lantarki shine E = V/d inda V = bambancin ƙarfin lantarki = ƙarfin lantarki da d = nisa don haka na'urar filin lantarki ita ce Volt/mita (V/m). Tsarin yawan halin yanzu shine J = I/A inda I = wutar lantarki da A = yankin giciye na mai jagoranci, don haka na'urar yawan halin yanzu ita ce murabba'in Ampere/mita (A/m2 ) . Daidaiton juriya shine ρ = E/J don haka na'urar juriya shine V/m : A/m 2 = V/mxm 2 / A = V/A (m) = Ω m (karanta: Ohmmeter). Ω = Volt / Ampere na'urar juriya ne ta lantarki.
Mafi girman ƙimar juriya ita ce mallakar na'urorin hana lantarki ko kuma, yayin da ƙaramin juriya ke mallakar na'urar lantarki mai kyau. Mafi kyawun mai ba da wutar lantarki yana isar da wutar lantarki, haka nan ƙaramin juriya na nau'in mai ba da wutar lantarki. Tsarin masu ba da wutar lantarki na ƙarfe waɗanda ke da mafi girma zuwa mafi ƙanƙanta juriya shine tin, ƙarfe, aluminum, zinariya, jan ƙarfe, azurfa. Don haka, za a iya kammala da cewa ƙimar juriya na abu yana nuna ma'aunin ikon abu na hana wutar lantarki.
Mai jagoranci mai kyau kuma mai bin dokar Ohm, a wani yanayi mai zafi, ƙimar juriya ba ta dogara da filin lantarki ba, ma'ana idan filin lantarki ya canza ƙimar juriya ba ta canzawa. Akasin haka, ga masu jagoranci waɗanda ba sa bin dokar Ohm, ƙimar juriya ta dogara ne da filin lantarki, ma'ana idan girman filin lantarki ya canza to ƙimar R ma tana canzawa.
Juriyar na'urar sarrafa ƙarfe ta dogara ne da zafin jiki. Idan zafin ƙarfe ya ƙaru, juriyar ƙarfe tana ƙaruwa, yayin da idan zafin ƙarfe ya ragu, juriyar ƙarfe tana raguwa. Yayin da zafin jiki ke ƙaruwa, ƙwayoyin halitta suna motsawa da sauri kuma ana shirya su ba bisa ƙa'ida ba don su toshe motsin electrons, wanda ke sa kwararar electrons ta yi jinkiri. Lokacin da zafin jiki ya ragu, ƙwayoyin halitta suna motsawa a hankali kuma ana shirya su akai-akai don kwararar electrons ta yi laushi.
Akasin juriya shine juriya. A lissafi, ana bayyana alaƙar da ke tsakanin juriya da juriya ta hanyar lissafi:
σ = 1/ ρ
σ = watsa wutar lantarki, ρ = juriya.
Naúrar juriya ita ce Ωm don haka naúrar watsawa ita ce 1 / Ωm = (Ωm) -1
Mafi girman ƙimar wutar lantarki ita ce mallakar na'urar lantarki, yayin da ƙaramin ƙimar wutar lantarki mallakar na'urar lantarki ce ko kuma na'urar lantarki mara kyau. Mafi kyawun na'urar lantarki tana isar da wutar lantarki, haka nan mafi girman ƙarfin wutar lantarki. Tsarin na'urorin lantarki masu ƙarfin lantarki mafi girma zuwa mafi ƙanƙanta shine azurfa, jan ƙarfe, zinariya, aluminum, ƙarfe, da tin. Don haka, za a iya kammala da cewa ƙimar ƙarfin wutar lantarki na abu yana nuna ma'aunin ikon abin na ɗaukar wutar lantarki. Azurfa tana da babban ƙarfin wutar lantarki amma tana da tsada don haka ana amfani da jan ƙarfe sosai a matsayin na'urar lantarki.
