Impedance vs Resistance
Resistance thiab impedance yog ob qho tseem ceeb heev ntawm cov khoom hauv Circuit Court. Kab lus no yuav saib mus rau qhov sib txawv tseem ceeb ntawm impedance thiab kuj.
Txhob Cia Siab
Kev tiv thaiv yog ib qho khoom tseem ceeb hauv kev lag luam hluav taws xob thiab hluav taws xob. Qhov kev tawm tsam hauv cov ntsiab lus zoo qhia peb tias nws nyuaj npaum li cas rau qhov hluav taws xob ntws. Hauv kev txiav txim siab ntau, qhov kev tawm tsam ntawm ob lub ntsiab lus tuaj yeem txhais tau tias yog qhov sib txawv ntawm qhov voltage uas yuav tsum tau coj ib chav tsev tam sim no hla ob lub ntsiab lus. Hluav taws xob tsis kam yog qhov hloov pauv ntawm hluav taws xob conduction. Qhov kev tiv thaiv ntawm ib yam khoom yog txhais raws li qhov piv ntawm qhov hluav taws xob thoob plaws hauv qhov khoom, mus rau qhov tam sim no ntws los ntawm nws. Qhov kev tiv thaiv nyob rau hauv ib tug conductor nyob ntawm seb tus nqi ntawm cov dawb electrons nyob rau hauv nruab nrab. Qhov tsis kam ntawm ib qho semiconductor feem ntau yog nyob ntawm tus naj npawb ntawm doping atoms siv (impurity concentration). Ohm txoj cai yog tib txoj cai lij choj uas muaj hwj chim tshaj plaws thaum lub ntsiab lus tsis kam tham. Nws hais tias rau qhov muab qhov kub thiab txias, qhov sib piv ntawm qhov hluav taws xob hla ob lub ntsiab lus, mus rau qhov tam sim no dhau los ntawm cov ntsiab lus, yog tas li. Qhov no tsis tu ncua yog hu ua qhov tsis kam ntawm ob lub ntsiab lus. Qhov tsis kam yog ntsuas hauv ohms.
Impedance
Muaj ob hom khoom siv cais raws li lawv cov lus teb impedance. Ob hom no yog active Cheebtsam thiab passive Cheebtsam. Active Cheebtsam hloov lawv kuj raws li qhov input voltage los yog tam sim no. Ib tug passive tivthaiv muaj ib tug ruaj tsis kam. Cheebtsam xws li capacitors thiab inductors yog active Cheebtsam. Ib tug resistor yog ib tug passive tivthaiv. Active Cheebtsam muaj lwm yam khoom ntawm kev hloov cov theem ntawm cov teeb liab tuaj. Yog tias cov theem sib txawv ntawm qhov hluav taws xob nkag thiab tam sim no yog xoom, cov zis tawm los ntawm lub capacitor lossis inductor yuav ua rau tam sim no lag luam lossis ua rau lub zog. Txawm li cas los xij, nws yuav tsum raug sau tseg tias yog tias cov cuab yeej no zoo tagnrho, qhov kev tiv thaiv yuav yog xoom. Ib feem ntawm qhov impedance tsis tshwm sim vim tib yam vim li cas qhov kev tawm tsam tshwm sim. Xav txog ib qho inductor kauj. Thaum ib tug tam sim no pib khiav los ntawm ib tug magnetic teb yog tsim. Lub magnetic teb nws tus kheej yog sim txo qhov tam sim no increment, yog li tsim lub impedance. Txawm li cas los xij, tsis yog tag nrho cov khoom siv zoo tagnrho hauv kev xyaum; Txhua yam khoom muaj tus nqi impedance, uas tsis yog kev tawm tsam. Ib lub voj voog nrog kev sib xyaw ntawm inductors (L), capacitors (C), thiab resistors (R) yog hu ua LCR circuit. Kev sib xyaw ua ke uas muaj qhov siab tshaj plaws impedance (hauv impedance vs. input zaus zaj duab xis) yog zaus txiav tawm cov ntxaij lim dej, thiab ib lub voj voog uas muaj impedance yam tsawg kawg nkaus tuaj yeem siv los ua ib lub voj voog tuner lossis zaus dhau lim.
Qhov txawv ntawm Impedance thiab Resistance yog dab tsi?
• Resistance is a special case of impedance.
• Qhov kev tiv thaiv ntawm ib feem tsis yog nyob ntawm qhov zaus lossis theem ntawm cov teeb liab tawm tswv yim, tab sis qhov impedance ua.
• Ib lub rooj sib tham yog tsim los ntsuas tus nqi tiv thaiv dawb huv thiab qhov kev xav txog tus nqi sib npaug rau ib leeg; complex algebra yog siv los daws qhov impedance.
• Kev tawm tsam tsis tuaj yeem hloov theem ntawm lub teeb liab, tab sis induction hloov tau.
