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Define resistance or specific resistance and write a note on it. |
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Answer» Solution :* "The electrical resistance of any object is DIRECTLY PROPORTIONAL to its length L and inversely proportional to its area of cross section A". `R prop(l)/(A)` `therefore R=rho((l)/(A)) and rho=R((A)/(l))` * Unit : SI unit of resistance is ohm meter `(Omegam)` and some times it will be ohm centimetre `(Omegacm)`. Note : IUPAC recommends the USE of the term resistivity over SPECIFIC resistance. * In short, resistivity means resistance. SI unit of `rho=R((A)/(l))""|Where, A=1m^(2)"",l=1m, R=rho` `=((Omega)(m)^(2))/(m)=Omegam` `1Omegam=100Omegacm` `1Omegacm=0.01Omegam` |
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