Resistivity, feem ntau cim los ntawm Greek tsab ntawv rho, ρ, yog ntau npaum li cas sib npaug R ntawm cov qauv xws li ib tug hlau, muab faib los ntawm nws tus ntoo khaub lig-sectional cheeb tsam A, thiab muab faib los ntawm nws ntev l; ρ=RA/l. Chav tsev ntawm qhov tsis kam yog ohm.
resistivity nrog piv txwv yog dab tsi?
Piv txwv li, qhov kev tiv thaiv ntawm tooj liab feem ntau muab raws li: 1.72 x 10- 8Ωm. Lub resistivity ntawm ib yam khoom yog ntsuas nyob rau hauv units ntawm Ohm-Metres (Ωm) uas yog tseem cuam tshuam los ntawm kub. … Conductivity, σ yog tus reciprocal ntawm cov resistivity. Qhov ntawd yog 1 / ρ thiab muaj chav tsev ntawm siemens ib meter, S / m.
Dab tsi yog qhov kev tiv thaiv ntawm cov khoom?
Resistivity ntawm cov khoom yog txhais raws li qhov kev tawm tsam muab rau tam sim no ntws los ntawm tus neeg xyuas pib ntawm chav tsev ntev uas muaj thaj tsam ntawm ntu ntuNws yog cov cuab yeej ntawm cov khoom siv, tsis nyob ntawm lub cev qhov ntev. Chav tsev yog ohm-meter (Ωm) Resistance ntawm ib yam khoom muaj feem xyuam rau resistivity raws li nram no: R=Aρ l
Vim li cas kev tiv thaiv tseem ceeb?
Cov khoom siv tiv thaiv yog qhov tseem ceeb raws li nws ua kom cov ntaub ntawv raug siv rau hauv qhov chaw zoo hauv cov khoom siv hluav taws xob thiab hluav taws xobCov khoom siv los ua cov khoom siv, piv txwv li hauv hluav taws xob thiab dav kev sib txuas hlau yuav tsum muaj peev xwm muaj qib qis ntawm kev tiv thaiv.
ntsuas qhov ntsuas qhov twg?
Semiconductor cov ntaub ntawv tshawb fawb thiab ntsuas cov cuab yeej feem ntau suav nrog kev txiav txim siab qhov kev tawm tsam thiab Hall txav ntawm tus qauv. Lub resistivity ntawm cov khoom siv semiconductor feem ntau yog nyob ntawm cov doping ntau. Hauv ib lub cuab yeej, qhov kev tiv thaiv tuaj yeem cuam tshuam rau lub peev xwm, qhov kev tiv thaiv kab mob, thiab qhov pib voltage.
