Resistivity, feem ntau cim los ntawm Greek tsab ntawv rho, ρ, yog ntau sib npaug rau qhov tsis kam R ntawm cov qauv xws li cov xaim, muab faib los ntawm nws qhov chaw hla ntu A, thiab muab faib los ntawm nws qhov ntev l; ρ=RA/l. Chav tsev ntawm qhov tsis kam yog ohm.
Puas yog resistivity ntawm tus neeg xyuas pib?
Resistivity yog hais txog qhov hluav taws xob tsis kam ntawm ib tus neeg xyuas pib ntawm ib chav tsev ntu ntu ntu thiab chav tsev ntevNws yog ib qho khoom ntiag tug ntawm txhua yam khoom. Tsis tas li ntawd, cov kws tshaj lij tuaj yeem siv qhov kev tiv thaiv rau kev sib piv cov khoom sib txawv raws li lawv lub peev xwm los ua hluav taws xob tam sim no.
Puas yog qhov kev tiv thaiv ntawm Ib lub xaim hloov?
A.
Yuav ua li cas tiv thaiv ib lub xaim cuam tshuam rau nws qhov kev tiv thaiv?
Resistivity xam
yuav muaj resistance R=ohms… Txawm hais tias nws yog qhov kub thiab txias, nws tuaj yeem siv rau ntawm qhov ntsuas kub los ntsuas qhov tsis kam ntawm cov xaim ntawm qhov muab geometry.
Txoj kev tiv thaiv ntawm ib txoj hlua qhia dab tsi?
Resistance yog ntsuas ntawm qhov kev tawm tsam rau tam sim no ntws hauv hluav taws xob. Kev tawm tsam yog ntsuas hauv ohms, cim los ntawm Greek tsab ntawv omega (Ω).
