Resistors yog cov khoom ntawm cov hluav taws xob hluav taws xob uas tiv thaiv kev hla ntawm hluav taws xob tam sim no. Lawv yog siv nyob rau hauv tag nrho cov hluav taws xob circuits, txawm lub feem ntau elementary sawv daws yuav. Resistors yog qhov txawv raws li cov hauv qab no: los ntawm lub hwj chim, los ntawm tus nqi ntawm cov nominal resistance, los ntawm cov chav kawm raug, los ntawm hom, thiab lwm yam nyob rau hauv tsab xov xwm no, peb yuav xav txog xws li ib tug nqi ntawm ib tug resistor. Nws yog dab tsi? Tus nqi ntawm cov khoom tiv thaiv yog tus nqi ntawm qib ntawm kev tiv thaiv sab hauv mus rau qhov kev nkag ntawm hluav taws xob tam sim no los ntawm nws. Hauv hluav taws xob engineering, tus nqi resistor yog qhia los ntawm Latin tsab ntawv R. Tus nqi no feem ntau yog sau rau hauv cov ntsuas ntsuas xws li ohms. Chav tsev no tau txais nws lub npe nyob rau hauv kev hwm ntawm tus naas ej German physicist Georg Simon Ohm, paub txog nws txoj hauj lwm hauv kev kawm txog hluav taws xob tam sim no. Vim li cas koj thiaj yuav tsum paub tus nqi ntawm cov resistors? Txhawm rau xaiv cov khoom tsim nyog rau lub voj voog tsim lossis xaiv qhov analogue thaum kho cov khoom siv.
Cia peb xav txog txoj hauv kev ntawm kev sau cov nominal kuj tseem ceeb ntawm lub cev ntawm cov ntsiab lus. Muaj peb txoj hauv kev los sau cov resistors:digital - suav nrog cov lej nkaus xwb; cim - yog ua ke, nrog rau cov zauv kuj muaj cov tsiaj ntawv; thiab, thaum kawg, xim - yog cov kab txaij hla ntawm cov xim sib txawv, cov kab txaij sib txawv, ntawm 3 txog 5.
Tom ntej no, peb yuav txheeb xyuas seb tus nqi ntawm cov resistor sau li cas nyob ntawm hom khoom. Hlau-hom tsis tu ncua cov ntsiab lus yog lub cylindrical chim. Cov ntsiab lus zoo li no raug cim rau hauv peb txoj kev. Cov ntaubntawv povthawj siv tsuas yog siv rau cov resistors uas tus nqi nominal tsis tshaj 999 ohms. Nws zoo li no: 2, 0; 220; 750. Txhais tau hais tias, raws li: 2 ohms, 220 ohms thiab 750 ohms. Cov ntaub ntawv hauv qab no siv cov tsiaj ntawv ntawm cov tsiaj ntawv Latin es tsis txhob siv lub cim: R - txhais tau tias ib qho; K - kilo, uas yog, 1000; M - mega, uas yog, 1000000. Nws hloov tawm hais tias nrog rau txoj kev kaw no, thiaj li yuav tau txais tus nqi ntawm cov resistor, nws yog ib qhov tsim nyog yuav tau muab cov nqi digital los ntawm tus nqi ntawm tsab ntawv. Ib qho piv txwv ntawm xws li kev nkag: 220 R - txhais tau tias 220 ohms; 3K2 - txhais tau tias 3200 Ohm; 1M1 - txhais tau tias 1100 kOhm
Xim coding ntawm tus nqi nominal nkag yog siv thoob plaws lub cev cylindrical ntawm lub caij. Nyob rau hauv Soviet-ua resistors, lub cim tau siv nrog ib qho offset rau ib sab, qhov no qhia tau hais tias pib ntawm lub decoding countdown. Nyob rau hauv cov khoom niaj hnub no, kab txaij kawg ntawm barcode yeej ib txwm kub lossis nyiaj, thiab nws txhais tau hais tias cov chav kawm tsis raug (5 lossis 10%). Nyob rau hauv cov kev tshwm sim hais tias lub cim muaj tsuas yog peb kab txaij, lub default precision class20 feem pua yog xav tias. Lub encoding, muaj 3-4 bands, nyob rau hauv thawj ob muaj tus nqi ntawm lub ntsej muag tus nqi, thiab lub thib peb - tus nqi ntawm tus multiplier. Ib qho encoding ntawm 5-6 bands hauv thawj peb muaj tus nqi ntawm lub ntsej muag tus nqi, thiab hauv plaub - tus nqi ntawm tus lej sib npaug.
Lwm yam kev tiv thaiv yog nti resistor lossis SMD resistor. Nyob rau hauv xws li resistors, lub cim yog digital thiab cim. Nws yog deciphered yooj yim: hauv digital marking, thawj tus lej qhia tus nqi ntawm lub ntsej muag tus nqi, thiab qhov kawg qhia tus lej ntawm xoom; hauv cov cim - thawj ob tus lej qhia tus nqi ntawm lub ntsej muag, thiab tus cim kawg - tus nqi ntawm tus lej sib npaug.
Nyob rau hauv qhov sib txawv ntawm cov resistors, tus qauv cim ntawm tus nqi nominal yog siv cov lej thiab cov tsiaj ntawv ntawm cov tsiaj ntawv Latin.
