Nthawi zambiri zimawoneka kuti oyambitsa ambiri akukankhira kukana pokonza dera, ndipo amachotsedwa ndikuwotchedwa.Ndipotu, pali zambiri zokonza.Malingana ngati mumvetsetsa kuwonongeka kwa kukana, simukuyenera kuthera nthawi yochuluka.

Resistor ndiye gawo lochulukirapo pazida zamagetsi, koma si gawo lomwe lili ndi chiwopsezo chachikulu kwambiri.Dera lotseguka ndilo mtundu wofala kwambiri wa kuwonongeka kwa kukana.Ndikosowa kuti kukana kukhale kwakukulu, ndipo ndizosowa kuti kukana kukhale kochepa.Zodziwika bwino zimaphatikizapo zopinga za filimu ya carbon, resistors film film, wire bala resistors and insurance resistors.

Mitundu iwiri yoyamba ya resistors ndiyo yomwe imagwiritsidwa ntchito kwambiri.Chimodzi mwamakhalidwe a kuwonongeka kwawo ndi kuwonongeka kwakukulu kwa kukana kochepa (pansi pa 100Ω) ndi kukana kwakukulu (pamwamba pa 100kΩ), ndi kukana kwapakatikati (monga mazana a ohms mpaka makumi a kiloohms) Kuwonongeka kochepa kwambiri;chachiwiri, pamene zopinga zochepa zowonongeka, nthawi zambiri zimawotchedwa ndikuda, zomwe zimakhala zosavuta kuzipeza, pamene zotsutsana kwambiri siziwonongeka kawirikawiri.

Ma Wirewound resistors nthawi zambiri amagwiritsidwa ntchito pochepetsa kwambiri, ndipo kukana sikuli kwakukulu.Pamene ma cylindrical mabala oletsa mabala atenthedwa, ena amasanduka akuda kapena pamwamba pake amaphulika kapena kusweka, ndipo ena sadzakhala ndi zizindikiro.Zotsutsa za simenti ndi mtundu wa zida za mabala a waya, zomwe zimatha kusweka zikatenthedwa, apo ayi sipadzakhala zowoneka.Pamene fuse resistor iyaka moto, chidutswa cha khungu chidzaphulika pamwamba, ndipo ena alibe zizindikiro, koma sichidzawotchedwa kapena kuda.Malingana ndi makhalidwe omwe ali pamwambawa, mukhoza kuyang'ana kuyang'ana kukana ndikupeza mwamsanga kukana kowonongeka.

Malinga ndi zomwe tazitchula pamwambapa, titha kuwona kaye ngati zopinga zotsika pa bolodi loyang'anira dera zili ndi zizindikiro zakuda zakuda, ndiyeno malinga ndi mawonekedwe omwe otsutsa ambiri amakhala otseguka kapena kukana kumakhala kokulirapo pamene zopinga zili. zowonongeka, ndipo zotsutsa zapamwamba zimawonongeka mosavuta.Titha kugwiritsa ntchito multimeter kuyeza mwachindunji kukana pa malekezero onse a high resistor resistor pa bolodi dera.Ngati kukana koyezera kuli kwakukulu kuposa kukana mwadzina, kukana kuyenera kuonongeka (zindikirani kuti kukana kumakhala kokhazikika pambuyo poti kuwonetserako kukhazikika. Pomaliza, chifukwa pangakhale zinthu zofanana za capacitive mu dera, pali njira yolipiritsa ndi kutulutsa. ), ngati kukana koyezera kuli kochepa kuposa kukana mwadzina, nthawi zambiri sikunyalanyazidwa.Mwa njira iyi, kukana kulikonse pa bolodi la dera kumayesedwa kamodzi, ngakhale chikwi chimodzi "chiphedwa molakwika", sichidzaphonya.