Lub resistor yog ib qho khoom siv hluav taws xob passive los tsim kev tawm tsam hauv qhov ntws ntawm hluav taws xob tam sim no. Nyob rau hauv yuav luag tag nrho cov hluav taws xob tes hauj lwm thiab hluav taws xob circuits lawv tuaj yeem pom. Qhov tsis kam yog ntsuas hauv ohms. Ib qho ohm yog qhov kev tawm tsam uas tshwm sim thaum tam sim no ntawm ib qho ampere dhau los ntawm cov resistor nrog ib qho volt poob hla nws cov terminals. Qhov tam sim no yog proportional rau qhov voltage hla lub davhlau ya nyob twg xaus. Qhov piv txwv no yog sawv cev los ntawmOhm txoj cai:

Resistor yog siv rau ntau lub hom phiaj. Qee qhov piv txwv suav nrog kev txwv tsis pub hluav taws xob tam sim no, kev faib hluav taws xob, hluav taws xob tsim hluav taws xob, kev sib txuam thiab kev thauj khoom, tswj kev nce, thiab txhim kho lub sijhawm. Lawv yog cov lag luam muag khoom nrog cov nqi tiv thaiv ntau tshaj li cuaj qhov kev txiav txim ntawm qhov loj. Lawv tuaj yeem siv los ua hluav taws xob nres kom dissipate kinetic zog los ntawm cov tsheb ciav hlau, los yog me dua ib square millimeter rau electronics.

Resistor Values ​​(Cov nqi nyiam)
Nyob rau xyoo 1950, kev tsim cov resistors ntau ntxiv tau tsim qhov kev xav tau ntawm cov qauv kev tiv thaiv tus nqi. Qhov ntau yam ntawm qhov tseem ceeb kuj yog standardized nrog thiaj li hu ua tus nqi nyiam. Cov txiaj ntsig xav tau yog txhais hauv E-series. Hauv E-series, txhua tus nqi yog qhov feem pua ​​​​siab dua li yav dhau los. Ntau yam E-series muaj nyob rau qhov sib txawv.

Resistor siv
Muaj kev hloov pauv loj heev hauv kev thov rau cov resistors; los ntawm precision Cheebtsam hauv cov khoom siv hluav taws xob digital, mus txog rau kev ntsuas cov khoom siv lub cev. Hauv tshooj no ob peb daim ntawv thov nrov tau teev tseg.

Resistors nyob rau hauv series thiab parallel
Nyob rau hauv hluav taws xob circuits, resistors feem ntau txuas nrog nyob rau hauv series los yog nyob rau hauv parallel. Piv txwv, tus tsim hluav taws xob hauv Circuit Court tej zaum yuav piv txwv li muab ob peb lub resistors nrog tus qauv tus nqi (E-series) kom ncav cuag tus nqi tshwj xeeb. Rau kev sib txuas series, qhov tam sim no los ntawm txhua tus resistor yog tib yam thiab qhov sib npaug sib npaug yog sib npaug rau cov lej ntawm tus neeg tiv thaiv. Rau kev sib txuas sib txuas, qhov hluav taws xob los ntawm txhua qhov resistor yog tib yam, thiab qhov sib txawv ntawm qhov sib npaug ntawm qhov sib npaug yog sib npaug rau qhov sib npaug ntawm cov nqi sib txawv rau txhua qhov sib npaug. Nyob rau hauv cov khoom resistors nyob rau hauv parallel thiab series ib tug ncauj lus kom ntxaws piav qhia txog kev suav piv piv yog muab. Txhawm rau daws cov kev sib txuas ntau dua, Kirchhoff txoj cai lij choj yuav raug siv.

Ntsuas hluav taws xob tam sim no (shunt resistor)
Cov hluav taws xob tam sim no tuaj yeem suav tau los ntawm kev ntsuas qhov ntsuas qhov ntsuas hluav taws xob dhau ntawm qhov ntsuas qhov ntsuas qhov tseeb nrog qhov paub txog kev tiv thaiv, uas txuas nrog hauv cov kab sib txuas. Qhov tam sim no yog xam los ntawm kev siv Ohm txoj cai. Qhov no yog hu ua ammeter lossis shunt resistor. Feem ntau qhov no yog qhov siab precision manganin resistor nrog tus nqi qis.

Resistant rau LEDs
LED teeb yuav tsum muaj qhov tshwj xeeb tam sim no los ua haujlwm. Ib qho tam sim no qis dhau yuav tsis teeb lub LED, thaum lub caij nyoog siab dhau lawm yuav hlawv tawm lub cuab yeej. Yog li ntawd, lawv feem ntau txuas nrog nyob rau hauv series nrog resistors. Cov no yog hu ua ballast resistors thiab passively tswj cov tam sim no hauv Circuit Court.

Blower lub cev muaj zog resistor
Nyob rau hauv lub tsheb lub tshuab cua tshuab yog actuated los ntawm ib tug kiv cua uas yog tsav los ntawm lub tshuab blower. Ib qho tshwj xeeb resistor yog siv los tswj cov kiv cua ceev. Qhov no yog hu ua blower motor resistor. Cov qauv sib txawv yog siv. Ib tug tsim yog ib tug series ntawm txawv me me wirewound resistors rau txhua tus kiv cua ceev. Lwm tus qauv tsim muaj kev sib koom ua ke tag nrho ntawm lub rooj tsav xwm luam tawm.