Equation yekudzivirira kwemagetsi
Munyaya yemutemo weOhm, fomura inotaura hukama huripo pakati pe voltage (V), magetsi (Ini), uye kupikisa magetsi (R) yakawanikwa. Yakaratidzwa nemasvomhu kuburikidza nemaequation:
Iyi equation inoratidza kuti resistance yemagetsi (R) inoenderana zvakananga nemagetsi (V) uye inoenderana nemagetsi (I). Kana mains voltage yakakura kupfuura resistance yemagetsi iri kukura, pane zvinopesana, kana magetsi emagetsi akasimba kupfuura resistance yemagetsi ichave yakakura. Iyi equation inotsanangura mutemo weOhm chete kana resistance yemagetsi (R) iri kuramba iripo. Kana resistance yemagetsi isiri kuramba iripo, saka iyi equation haitsananguri mutemo weOhm, asi inotsanangura resistance yemutyairi.
Muchinyorwa pamusoro pemutemo weOhm, hukama huripo pakati pekudzivirira kwemudhudhudhu wemagetsi (R), kuramba kwemhando kana kuramba kwemudhudhudhu (ρ), kureba kwemudhudhudhu (l), uye nzvimbo yemudhudhudhu (A) hwakatsanangurwa nemasvomhu. Zvakatsanangurwa muequation:
Zvichibva pachiyero ichi, zvakagumiswa kuti kuramba kwemagetsi kunoenderana zvakananga nekuramba kwerudzi nehurefu hwemubati, asi kunoenderana zvakanyanya nenzvimbo yemubati. Nemamwe mashoko, kuramba kwemagetsi kunowedzera kana kuramba kwerudzi nehurefu hwemubati kuchiwedzera, nepo kuramba kwemagetsi kuchiderera kana nzvimbo yemubati ikawedzera.
Kana kureba kwemuchina (l) nenzvimbo yepakati pechikamu (A) zvikaramba zviripo, kuramba kwemagetsi (R) kunoenderana chete nerudzi rwekuramba (ρ). Kana rudzi rwekuramba rukawedzera, kuramba kwemagetsi kunowedzera, zvakasiyana kana rudzi rwekuramba rukadzikira, kuramba kwemagetsi kunoderera. Kukosha kwekuramba kwerudzi rwemuchina wega wega kunoenderana netembiricha,
kana tembiricha ikakwira kupfuura rudzi rwekupikisa kuri kukura kana kuti zvakasiyana, kana tembiricha ikaderera pane kupikisa kwerudzi urwu ikaderera.
Rudzi rwakasiyana rwekudzivisa (resistivity) i conductivity. Conductivity inoenderana zvakanyanya ne resistivity, sezvakataurwa mu equation iri pazasi:
Kana ikataurwa mu conductivity, equation 2 inoshanduka kuita:
Zvichibva pakuenzanisa uku, zvinogona kugumiswa kuti kuramba kwemagetsi kunoenderana zvakanyanya nekufambisa magetsi,
kana conductivity yemuchina wekufambisa magetsi yakakura kupfuura resistance yemagetsi ikaderera kana kuti zvakasiyana, kana conductivity yemuchina wekufambisa magetsi ikaderera pane resistance yemagetsi yakakura.
Kukosha kwekudzivirira kwemhando yega yega yezvinhu kunoratidzwa mutafura iri pazasi.
Chikamu chekudzivirira
Chikamu chemagetsi chinonzi Volt, chikamu chemagetsi chinonzi Ampere saka chikamu chekudzivirira magetsi chinonzi Volt / Ampere. Volt / Ampere inonziwo Ohm inomiririrwa neΩ, ichikoshesa Georg Simon Ohm (1789-1854), nyanzvi yefizikisi yekuGermany. Kunze kweOhm, inoshandiswawo mayuniti e kilo-ohm ne megaohm. 1 kilo-ohm (kΩ) = 1000 Ω = 103 Ω, nepo 1 mega-ohm (MΩ) = 1000,000 Ω = gumi6 Ω.
Zvishandiso zvekuyera zvekudzivirira
Chishandiso chekuyera simba remagetsi chinonzi ohmmeter. Chishandiso ichi chekuyera chakabatanidzwa mu multimeter, chishandiso chekuyera simba remagetsi, simba remagetsi, uye simba remagetsi.
