Tsarin Juriya da Wutar Lantarki
A cikin labarin game da Dokar Ohm an samo wata dabara da ke bayyana dangantakar da ke tsakanin ƙarfin lantarki (V), wutar lantarki (I) da juriyar wutar lantarki (R). An bayyana ta hanyar lissafi ta hanyar lissafi:
Wannan ƙa'idar ta nuna cewa juriyar lantarki (R) daidai gwargwado ne kai tsaye ga ƙarfin lantarki (V) kuma daidai gwargwado ne ga lissafin lissafin (I). Idan ƙarfin lantarki ya fi girma to juriyar ta fi girma, akasin haka idan ƙarfin lantarki ya fi girma to juriyar ta fi girma. Wannan lissafi yana bayyana dokar Ohm ne kawai lokacin da juriyar (R) ta kasance mai dorewa. Idan juriyar ba ta da tabbas to wannan lissafi ba ya bayyana dokar Ohm amma yana bayyana juriyar mai jagora.
A cikin labarin mai taken dokar Ohm, an kuma yi bayani game da alaƙar da ke tsakanin juriyar jagora (R). nau'in juriya ko juriyar mai jagora (ρ), tsawon mai jagora (l) da yankin giciye-sashe na mai jagora (A). An bayyana shi ta hanyar lissafi a cikin lissafin:
Bisa ga wannan lissafi, an kammala da cewa juriya tana daidai gwargwado kai tsaye ga takamaiman juriya da tsawon mai gudanarwa, amma tana daidai gwargwado da yankin mai gudanarwa. A wata ma'anar, juriya tana ƙaruwa yayin da takamaiman juriya da/ko tsawon mai gudanarwa ke ƙaruwa. Juriya tana raguwa yayin da yankin mai gudanarwa ke ƙaruwa.
Idan tsawon mai jagora (l) da yankin giciye-sashe (A) sun kasance iri ɗaya, to juriya (R) ta dogara ne kawai akan juriya (ρ). Yayin da juriya ke ƙaruwa, juriya tana ƙaruwa. Yayin da juriya ke raguwa, juriyar lantarki tana raguwa. Ƙimar juriya ta kowane mai jagora tana daidai da zafin jiki kai tsaye. Idan zafin jiki ya fi girma, juriya tana ƙaruwa, ko akasin haka, idan zafin jiki ya yi ƙasa, juriya tana raguwa.
Gudanar da wutar lantarki
Akasin haka nau'in juriya wanda aka fi sani da resistivity shine conductivity. Conductivity yana da daidaiton juzu'i da resistivity, kamar yadda aka bayyana ta hanyar lissafin da ke ƙasa:
Idan aka bayyana shi dangane da yanayin aiki, to lissafi na 2 ya canza zuwa:
Bisa ga wannan lissafi, an kammala da cewa juriyar lantarki tana da daidaiton juyi da juriyar lantarki, idan juriyar mai jagora ta fi girma, juriyar ta fi ƙanƙanta, ko akasin haka, idan juriyar mai jagora ta fi ƙanƙanta, juriyar ta fi girma.
Ana nuna ƙimar juriya na kowane abu a cikin teburin da ke ƙasa.
Naúrar
Naúrar wutar lantarki ita ce volt, naúrar wutar lantarki ita ce ampere, don haka naúrar juriya ita ce volt/ampere. Ana kuma kiran volt/ampere da ohm kuma ana nuna shi da Ω, don girmama Georg Simon Ohm (1789-1854), masanin kimiyyar lissafi na Jamus. Bayan ohm, ana kuma amfani da kiloohm da megaohm. 1 kiloohm (kΩ) = 1000 Ω = 103 Ω, yayin da 1 megaohm (MΩ) = 1000.000 Ω = 106 .
Kayan aikin aunawa
Kayan aikin da ake amfani da shi don auna juriyar lantarki shine ohmmeter. An haɗa wannan kayan aikin aunawa cikin multimeter, na'urar auna ƙarfin lantarki, wutar lantarki, da juriya. An tattauna ohmmeters sosai a cikin labarin kan kayan aikin auna lantarki.
