Fomura Yekudzivirira Magetsi
Muchinyorwa pamusoro pemutemo weOhm, fomura yakawanikwa inotaura hukama huripo pakati pemagetsi emagetsi (V), magetsi emagetsi (I) uye kuramba kwemagetsi (R). Pamasvomhu, inoratidzwa kuburikidza ne equation:
Iyi equation inoratidza kuti resistance yemagetsi (R) inoenderana zvakananga nevoltage (V) uye inoenderana necurrent (I). Kana voltage yakakura, resistance inowedzera. Kusiyana neizvi, kana current yakakura, resistance inowedzerawo. Iyi equation inotsanangura mutemo weOhm chete kana resistance (R) iri constant. Kana resistance isiri constant, iyi equation haitsananguri mutemo weOhm asi inotsanangura resistance yeconductor.
Muchinyorwa chinonzi Mutemo weOhm, hukama huripo pakati pekudzivirira kwemuchina (R), kuramba kwemuchina (ρ), kureba kwemuchina (l) nenzvimbo yemuchina (A) zvinotsanangurwawo . Panyaya yemasvomhu, zvinoratidzwa muequation:
Zvichibva pakuenzanisa uku, zvakagumiswa kuti kuramba kwakanangana nekuramba kwakanangana nehurefu hwemubati, asi kwakaenzana nenharaunda yemubati. Nemamwe mashoko, kuramba kunowedzera sezvo kuramba kwakanangana uye/kana hurefu hwemubati huchiwedzera. Kuramba kunoderera sezvo nzvimbo yemubati inowedzera.
Kana kureba kwemutyairi (l) nenzvimbo yepakati (A) zvikaramba zviripo, saka kudzvinyirirwa (R) kunoenderana chete nekudzvinyirirwa (ρ). Sezvo kudzvinyirirwa kuchiwedzera, kudzvinyirirwa kunowedzera. Sezvo kudzvinyirirwa kuchiderera, kudzvinyirirwa kwemagetsi kunoderera. Kukosha kwemutyairi wega wega kunoenderana zvakananga netembiricha. Kana tembiricha yakakwira, kudzvinyirirwa kunowedzera, kana zvinopesana, kana tembiricha yakadzikira, kudzvinyirirwa kunoderera.
Kufambisa kwemhepo
Chinosiyana che resistivity i conductivity. Conductivity inoenderana ne resistivity, sezvakaratidzwa mu equation iri pazasi:
Kana zvikatsanangurwa maererano ne conductivity, equation 2 inoshanduka kuita:
Zvichibva pachiyero ichi, zvakagumiswa kuti kuramba kwemagetsi kunoenderana nekugona kufambisa magetsi, kana kugonesa kwemubati wemagetsi kuri kukuru, kuramba kuri kudiki, kana zvinopesana, kana kugonesa kwemubati wemagetsi kuri kudiki, kuramba kuri kukuru.
Hunhu hwekudzivirira hwechinhu chimwe nechimwe hunoratidzwa mutafura iri pazasi.
Chikamu
Chiyero chemagetsi chevoltage ndicho Volt, chiyero chemagetsi chemagetsi ndicho Ampere, saka chiyero cheresistance ndicho Volt/Ampere. Volt/Ampere inonziwo Ohm, inomiririrwa neΩ, zvichikudza Georg Simon Ohm (1789-1854), nyanzvi yefizikisi yekuGermany. Kunze kweOhm, mayuniti ekioohm nemegaohm anoshandiswawo. 1 kiloohm (kΩ) = 1000 Ω = 10 3 Ω, nepo 1 megaohm (MΩ) = 1000.000 Ω = 10 6 Ω.
Chishandiso chekuyera
Chishandiso chinoshandiswa kuyera kuramba kwemagetsi chinonzi ohmmeter. Chishandiso ichi chekuyera chakabatanidzwa mu multimeter, chishandiso chekuyera voltage, current, uye resistance. Ma ohmmeter anokurukurwa zvakadzama munyaya inotaura nezvezvishandiso zvekuyera zvemagetsi.
