Resistance vs Resistivity
Cov khoom ntawm cov khoom yog cov khoom siv sab hauv lossis sab nraud. Intrinsic cuab yeej yog cov cuab yeej uas muaj kev ywj pheej raws li tus nqi ntawm cov khoom. Piv txwv li block ntawm tooj liab yuav muaj tib qhov ntom txawm tias nws me los yog loj. Txawm li cas los xij, qhov loj uas yog lwm yam khoom ntawm lub cev yog cov cuab yeej extrinsic raws li ib qho me me ntawm tooj liab yuav hnyav dua li qhov loj ntawm tooj liab. Yog li huab hwm coj yog ib qho cuab yeej extrinsic uas yog nyob ntawm tus nqi ntawm cov khoom tam sim no. Qhov sib txawv zoo sib xws muaj nyob nruab nrab ntawm kev ua haujlwm thiab kev tiv thaiv uas yog ob qho tseem ceeb ntawm lub cev ntawm cov khoom siv hluav taws xob. Cia peb mus saib ntxiv.
Resistivity yog ib qho khoom tseem ceeb ntawm tus neeg xyuas pib thiab yog ywj siab ntawm qhov loj ntawm tus neeg xyuas pib. Yog li ntawd, txhua qhov thaiv ntawm tooj liab (tus neeg xyuas pib) yuav muaj tib lub zog. Ntawm qhov tod tes, kev tiv thaiv yog ib qho cuab yeej extrinsic uas txhais tau hais tias nws nyob ntawm tus nqi ntawm cov khoom tam sim no. Yog li kev tiv thaiv ntawm ib qho thaiv ntawm tooj liab yog nyob ntawm qhov loj ntawm cov tooj liab block. Muaj cov qauv tshwj xeeb los piav qhia txog kev sib raug zoo ntawm kev tiv thaiv thiab kev tiv thaiv ntawm tus neeg xyuas pib uas yog raws li hauv qab no
R=p X l/A, Or, Resistance=Resistivity X length/area
Ntawm no, R yog qhov tsis kam, p yog qhov resistivity, l yog qhov ntev thiab A yog thaj tsam ntawm ntu ntu ntawm tus neeg xyuas pib los ntawm qhov uas tam sim no ntws. Txij li cheeb tsam nyob ntawm qhov zoo ntawm tus neeg xyuas pib, nws yuav tsum tau muab xam raws li cov duab. Rau ib lub cylindrical hlau, thaj tsam yog xam raws li hauv qab no.
A=pie X r²=
Nws yog kev tiv thaiv thiab tsis yog kev tiv thaiv uas raug coj mus rau hauv tus account thaum kawm cov ntsiab lus ntawm qhov hluav taws xob thiab tam sim no hauv hluav taws xob.
V=I X R=IR
No tseem hu ua Ohm's Law
Inverse of resistivity yog hu ua conductivity ntawm ib yam khoom thiab nws yog ib lub tswvyim uas yog siv ntau tshaj li lub tswvyim ntawm resistivity.
In luv:
Qhov Sib Txawv Ntawm Kev Tiv Thaiv thiab Kev Tiv Thaiv
• Resistance thiab resistivity yog cov khoom ntawm cov conductors qhov tsis kam yog ib qho cuab yeej extrinsic whereas resistivity yog ib qho khoom vaj khoom tsev
• Qhov no txhais tau hais tias kev tiv thaiv ntawm tus neeg xyuas pib ib txwm zoo ib yam thiab muaj kev ywj pheej raws li nws qhov ntev lossis qhov loj me
• Kev tawm tsam thiab kev tawm tsam ntawm cov khoom muaj feem cuam tshuam rau ib leeg los ntawm kev sib npaug uas yog raws li hauv qab no
• Resistivity=resistance X cheeb tsam ntawm kev hla ntu / ntev
