Chilinganizo cha Kukana Magetsi
Mu nkhani yokhudza lamulo la Ohm, njira yofotokozera ubale pakati pa magetsi (V), magetsi (I) ndi kukana kwa magetsi (R) yapezeka . Mwa masamu, imafotokozedwa kudzera mu equation iyi:
Chiyerekezo ichi chikuwonetsa kuti kukana kwamagetsi (R) kumafanana mwachindunji ndi magetsi (V) ndipo kumafanana molakwika ndi magetsi (I). Mphamvu yamagetsi ikakula, kukana kumakulirakulira. Mosiyana ndi zimenezi, mphamvu yamagetsi ikakula, kukana kumakulirakulirakulira. Chiyerekezochi chimafotokoza lamulo la Ohm pokhapokha ngati kukana (R) kuli kokhazikika. Ngati kukana sikukhazikika, chiyerekezochi sichikufotokoza lamulo la Ohm koma chimafotokoza kukana kwa woyendetsa.
Mu nkhani yotchedwa Ohm's Law, ubale pakati pa kukana kwa kondakitala (R), kukana kwa kondakitala (ρ), kutalika kwa kondakitala (l) ndi dera lodutsa gawo la kondakitala (A) wafotokozedwanso . Mwa masamu, izi zafotokozedwa mu equation:
Kutengera ndi equation iyi, zatsimikiziridwa kuti kukana kumagwirizana mwachindunji ndi kukana ndi kutalika kwa kondakitala, koma mosiyana ndi dera lopingasa la kondakitala. Mwanjira ina, kukana kumawonjezeka pamene kukana ndi/kapena kutalika kwa kondakitala kumawonjezeka. Kukana kumachepa pamene dera lopingasa la kondakitala likuwonjezeka.
Ngati kutalika kwa kondakitala (l) ndi dera lopingasa (A) ndizokhazikika, ndiye kuti kukana (R) kumadalira kokha kukana (ρ). Pamene kukana kukuwonjezeka, kukana kumawonjezeka. Pamene kukana kukuchepa, kukana kwamagetsi kumachepa. Mtengo wa kukana kwa kondakitala aliyense umagwirizana mwachindunji ndi kutentha. Ngati kutentha kuli kokwera, kukana kumawonjezeka, kapena mosemphanitsa, ngati kutentha kuli kotsika, kukana kumachepa.
Kuyendetsa bwino
Chotsutsana ndi resistivity ndi conductivity. Conductivity ndi yofanana ndi resistivity, monga momwe zafotokozedwera mu equation pansipa:
Ngati yafotokozedwa motsatira njira yoyendetsera magetsi, ndiye kuti equation 2 imasintha kukhala:
Kutengera ndi equation iyi, zatsimikiziridwa kuti kukana kwamagetsi kumasiyana malinga ndi kukana kwa magetsi, ngati kukana kwa kondakitala kuli kwakukulu, kukana kwake kuli kochepa, kapena mosemphanitsa, ngati kukana kwa kondakitala kuli kochepa, kukana kwake kumakhala kwakukulu.
Mtengo wa kukana kwa chinthu chilichonse ukuwonetsedwa mu tebulo ili m'munsimu.
Chigawo
Chigawo cha magetsi amagetsi ndi Volt, gawo la magetsi amagetsi ndi Ampere, kotero gawo la kukana ndi Volt/Ampere. Volt/Ampere imatchedwanso Ohm, yomwe imayimiridwa ndi Ω, kulemekeza Georg Simon Ohm (1789-1854), katswiri wa sayansi ya zaku Germany. Kupatula Ohm, mayunitsi a kiloohm ndi megaohm amagwiritsidwanso ntchito. 1 kiloohm (kΩ) = 1000 Ω = 10 3 Ω, pomwe 1 megaohm (MΩ) = 1000.000 Ω = 10 6 Ω.
Chida choyezera
Chida chomwe chimagwiritsidwa ntchito poyesa kukana kwamagetsi ndi ohmmeter. Chida choyezera ichi chimaphatikizidwa mu multimeter, chipangizo choyezera magetsi, mphamvu yamagetsi, ndi kukana. Ma ohmmeter akufotokozedwa mozama m'nkhani yokhudza zida zoyezera zamagetsi.
