Ntau tus neeg, txawm tias cov neeg nyob deb ntawm cov teeb meem ntawm physics, hluav taws xob engineering, hluav taws xob, tau hnov cov lus xws li "kuj", lossis lo lus tshiab - resistor. Txawm li cas los xij, tsawg tus neeg paub tias nws yog dab tsi thiab nws siv rau dab tsi. Yog li dab tsi yog qhov resistor?
Cov lus nug no yooj yim teb. Resistor yog ib qho ntawm cov khoom siv hluav taws xob ntau tshaj plaws hauv xov tooj cua engineering, TV-video-suab engineering. Cov yam ntxwv tseem ceeb ntawm cov resistors yog lawv qhov tsis kam, uas yog ntsuas hauv units ntawm ohms. Muaj ob lub ntsiab ntawm cov khoom siv no: lub hom phiaj dav dav thiab thiaj li hu ua ruaj khov. Dab tsi yog qhov ruaj khov resistor? Cov no yog cov khoom kim heev uas yog siv hauv cov khoom siv high-frequency ultra-precise. Yeej, lawv siv cov hom phiaj dav dav.
Qhov kev tiv thaiv ntawm cov hom phiaj dav dav tuaj yeem sib txawv li ntawm +/- 10%. Qhov tsis kam yog nyob ntawm qhov hu ua qhov kub thiab txias coefficient ntawm kev ua haujlwm (hauv cov ntawv tshwj xeeb koj tuaj yeem pom cov ntawv luv TCR). Feem ntau tus qauv resistors muaj qhov zoo coefficient. Qhov no txhais tau tias ntawmRaws li qhov kub thiab txias nce, yog li qhov tsis kam.
Tus resistor yog dab tsi ntawm nws cov yam ntxwv? Ib qho ntawm cov yam ntxwv tseem ceeb ntawm cov resistors tuaj yeem hu ua lub zog dissipation. Qhov no yog lub hwj chim loj uas nws tuaj yeem ploj mus yam tsis muaj kev puas tsuaj. Lub zog, raws li koj paub, ntsuas hauv cov ntsuas xws li Watts. Paub txog qhov nominal tsis kam thiab tam sim no ntws los ntawm cov hluav taws xob hluav taws xob, koj tuaj yeem xam lub zog. Nws pom los ntawm cov mis P \u003d I ^ 2R, qhov twg P yog lub hwj chim, kuv yog tus nqi ntawm tam sim no, R yog tus nominal tsis kam ntawm cov resistor. Los ntawm qhov no peb tuaj yeem xaus qhov resistor yog los ntawm qhov pom ntawm hluav taws xob engineering. Qhov no yog lub ntsiab lus tseem ceeb ntawm txhua qhov hluav taws xob hluav taws xob, lub luag haujlwm tseem ceeb uas yog muab lub npe nominal (paub) tsis kam rau qhov ntws ntawm cov hluav taws xob tam sim no los ntawm Circuit Court txhawm rau tswj qhov voltage thiab tam sim no. Rau lub hom phiaj ntawm kev tswj qhov hluav taws xob nyob rau hauv ib lub voj voog, feem ntau siv ballast resistor. Dab tsi yog ballast resistor? Cov cuab yeej no txuas nrog lub network thiab absorbs ib qho nyiaj ntawm qhov hluav taws xob ntau dhau, yog li sib npaug ntawm tus kheej tam sim no hauv cov ceg ntawm cov hluav taws xob hluav taws xob thiab tswj kev ruaj ntseg voltage. Lub resistor rau LED kuj tau teem rau ntawm cov qauv zoo sib xws. Yog li hais tias LED tsis tau hlawv tam sim ntawd los ntawm cov dej ntws los ntawm nws, qhov tam sim no-quenching resistor txuas nrog rau nws.
Qhov kev tiv thaiv ntawm tus resistor nyob ntawm cov khoom nws yog ua los ntawm. Nws kuj nyob ntawm qhov chaw txiav.(qhov loj dua qhov chaw txiav, qhov qis dua qhov tsis kam), ntawm qhov ntev ntawm qhov resistor (qhov ntev dua, qhov ntau dua qhov tsis kam, feem).
Resistor tau yooj yim cim los ntawm xim lossis los ntawm tus lej. Nrog kev pab los ntawm cov cim no, koj tuaj yeem pom cov cuab yeej tseem ceeb tshaj plaws ntawm txhua tus resistor, uas yog tus nqi ntawm nws qhov kev tawm tsam. Koj tuaj yeem paub seb qhov no lossis xim lossis tus lej txhais li cas hauv phau ntawv hla tebchaws ntaus ntawv lossis los ntawm cov chaw tsim khoom lossis tus muag khoom (piv txwv li hauv lub vev xaib).
