Zoo li ntau yam khoom siv hluav taws xob, cov resistors tuaj nyob rau hauv ntau daim duab, qhov ntau thiab tsawg, muaj peev xwm, thiab hom. Kuj tseem muaj qhov sib txawv ntawm cov nqi sib txawv rau cov suab nrov, kev ua siab ntev, kev ntsuas wattage, kub coefficient, voltage coefficient, zaus teb, qhov loj me, thiab kev ntseeg tau. Qee cov resistors yog qhov zoo tagnrho hauv qee qhov kev siv thiab qhov chaw ntawm kev daws teeb meem npau suav phem hauv lwm tus.
Nyob hauv phau ntawv qhia no, peb saib cov hom resistors thiab cov ntaub ntawv siv rau txhua tus.
Carbon Composition Resistors
Carbon muaj pes tsawg leeg resistors siv los ua hom resistor feem ntau vim yog tus nqi qis thiab kev ntseeg siab. Carbon muaj pes tsawg leeg resistors siv cov khoom thaiv ntawm cov khoom ua los ntawm cov hmoov carbon, insulating ceramic, thiab cov khoom siv khi. Kev tiv thaiv yog tswj los ntawm qhov sib txawv ntawm cov pa roj carbon monoxide rau cov ntaub ntawv muab tub lim.
Cov pa roj carbon muaj pes tsawg leeg hauv cov resistor cuam tshuam los ntawm ib puag ncig, tshwj xeeb tshaj yog cov av noo. Nws zoo li hloov hauv kev tawm tsam lub sijhawm. Vim li no, carbon muaj pes tsawg leeg resistors muaj qhov ua rau tsis zoo, feem ntau tsuas yog 5 feem pua. Cov pa roj carbon muaj pes tsawg leeg kuj tseem txwv rau kev ntsuas hluav taws xob txog li 1 watt. Nyob rau hauv sib piv rau lawv cov tsis zoo kam rau ua thiab tsis muaj zog, carbon muaj pes tsawg leeg resistors muaj ib tug zoo zaus teb, ua rau cov no siv tau rau high-frequency applications.
Carbon Film Resistors
Cov yeeb yaj kiab cov yeeb yaj kiab siv cov txheej nyias nyias ntawm cov pa roj carbon monoxide rau saum cov pas nrig insulating uas raug txiav los ua txoj hauv kev nqaim, ntev, tiv taus. Los ntawm kev tswj qhov ntev ntawm txoj kev thiab nws qhov dav, qhov kev tiv thaiv tuaj yeem raug tswj tau nruj nrog kev ua siab ntev li 1 feem pua.
tag nrho, lub peev xwm ntawm cov yeeb yaj kiab cov yeeb yaj kiab yog qhov zoo dua li cov pa roj carbon monoxide resistor, nrog lub zog ntsuas txog 5 watts thiab txhim kho kev ruaj ntseg. Txawm li cas los xij, qhov zaus teb yog qhov phem dua vim qhov inductance thiab capacitance tshwm sim los ntawm txoj kev resistive txiav rau hauv zaj duab xis.
Metal Film Resistors
Ib qho ntawm cov axial resistor hom siv niaj hnub no yog cov yeeb yaj kiab hlau resistors. Zoo ib yam li hauv kev tsim kho rau cov yeeb yaj kiab cov yeeb yaj kiab, qhov sib txawv tseem ceeb hauv qab no los ntawm kev siv cov hlau alloy ua cov khoom siv tiv thaiv tsis yog carbon.
Cov hlau alloy, feem ntau yog npib tsib xee-chromium alloy, muab kev tiv thaiv nruj dua li cov yeeb yaj kiab tiv thaiv nrog kev ua siab ntev nruj li 0.01 feem pua. Hlau zaj duab xis resistors muaj txog li 35 watts. Txawm li cas los xij, kev xaiv tsis kam pib poob qis dua 1 lossis 2 watts.
Hlau zaj duab xis resistors yog suab nrov. Cov resistors no ruaj khov nrog kev hloov pauv me ntsis vim qhov kub thiab qhov siv hluav taws xob.
Thick Film Resistors
Thick film resistors tau nrov nyob rau xyoo 1970s thiab yog cov nto mount resistors txawm niaj hnub no. Cov no yog tsim los ntawm kev tshuaj ntsuam luam ntawv txheej txheem siv cov khoom siv hluav taws xob ceramic-thiab-iav-cov khoom sib xyaw uas raug tshem tawm hauv cov kua. Tom qab lub resistor tau tshuaj ntsuam luam tawm, nws yog ci ntawm qhov kub thiab txias kom tshem tawm cov kua thiab fuse cov ceramic-thiab-iav composite.
Thaum pib, cov yeeb yaj kiab tuab muaj qhov ua rau tsis zoo. Niaj hnub no cov no muaj nyob nrog kev ua siab ntev li tsawg li 0.1 feem pua hauv pob khoom uas tuaj yeem ua haujlwm txog 250 watts. Thick zaj duab xis resistors muaj qhov kub-kub coefficient, nrog rau 100-degree Celsius kub hloov pauv ua rau mus txog 2.5 feem pua ntawm kev tiv thaiv.
Thin Film Resistors
Kev qiv los ntawm cov txheej txheem semiconductor, nyias zaj duab xis resistors yog tsim los ntawm cov txheej txheem nqus tsev vacuum hu ua sputtering. Sputtering yog qhov uas nyias txheej ntawm cov khoom siv hluav taws xob tso rau ntawm ib qho insulating substrate. Cov txheej nyias no yog duab-etched los tsim cov qauv tiv thaiv.
Los ntawm kev tswj hwm tus nqi ntawm cov khoom tso thiab cov qauv tiv thaiv, kev ua siab ntev nruj li 0.01 feem pua tuaj yeem ua tiav nrog nyias zaj duab xis resistors. Nyias zaj duab xis resistors raug txwv rau li 2.5 watts thiab qis voltages dua lwm hom resistor tab sis yog cov resistors ruaj khov. Muaj tus nqi rau qhov precision ntawm nyias zaj duab xis resistors, uas feem ntau yog ob npaug ntawm tus nqi ntawm cov yeeb yaj kiab tuab.
Wirewound Resistors
Lub zog siab tshaj plaws thiab qhov tseeb tshaj plaws yog cov kab hluav taws xob tiv thaiv, uas tsis tshua muaj zog thiab meej ib zaug. Wirewound resistors yog tsim los ntawm wrapping ib tug high-resistance hlau, feem ntau yog ib tug nickel-chromium alloy, nyob ib ncig ntawm ib tug ceramic bobbin. Los ntawm kev sib txawv ntawm txoj kab uas hla, qhov ntev, alloy ntawm cov hlau, thiab cov qauv qhwv, cov khoom ntawm cov hlau wound resistor tuaj yeem ua raws li daim ntawv thov.
Resistance tolerances yog nruj li 0.005 feem pua rau precision wirewound resistors thiab tuaj yeem pom nrog lub zog ntsuas txog li 50 watts. Fais fab wirewound resistors feem ntau muaj qhov kam rau ntawm 5 feem pua lossis 10 feem pua tab sis muaj qhov ntsuas hluav taws xob nyob rau hauv kilowatt ntau.
Wirewound resistors raug kev txom nyem los ntawm qhov siab inductance thiab capacitance vim qhov kev tsim kho, txwv cov no rau cov ntawv thov tsawg zaus.
Potentiometers
Varying lub teeb liab lossis kho lub voj voog yog qhov yuav tsum tau muaj rau cov ntawv thov hluav taws xob rhiab heev. Ib txoj hauv kev yooj yim los kho lub teeb liab manually yog los ntawm qhov sib txawv ntawm cov resistor lossis potentiometer. Potentiometers feem ntau yog siv rau cov neeg siv khoom siv analog, xws li kev tswj lub ntim. Qhov me me-mount versions qhib lossis ntsuas lub voj voog ntawm PCB ua ntej raug kaw thiab xa mus rau cov neeg siv khoom.
Potentiometers yuav yog qhov tseeb, ntau qhov sib txawv ntawm qhov sib txawv, tab sis feem ntau yog cov khoom siv ib zaug tig yooj yim uas txav lub wiper raws txoj kab hluav taws xob hloov pauv los ntawm zero mus rau qhov siab tshaj plaws.
Potentiometers feem ntau muaj qhov ntsuas hluav taws xob tsawg, cov yam ntxwv tsis zoo, thiab kev ruaj ntseg nruab nrab. Txawm li cas los xij, muaj peev xwm sib txawv ntawm qhov tsis kam thiab kho lub teeb liab ua rau potentiometers tsis muaj nuj nqis hauv ntau qhov kev tsim hluav taws xob thiab kev tsim qauv.
Lwm yam Resistor
Raws li nrog rau feem ntau cov khoom, ntau yam tshwj xeeb resistor variants pab niche xav tau. Ob peb muaj ntau heev, nrog rau cov khoom tiv thaiv nyob rau hauv lub teeb incandescent. Lwm yam tshwj xeeb resistor variants muaj xws li cov khoom cua sov, hlau ntawv, oxide, shunts, cermet, thiab daim phiaj resistors.
