CBSE Class 10 Answered
Explain me the definition of resistivity & the difference between resistance and resistivity.
Asked by sharmistha.panda | 16 May, 2011, 04:43: PM
Expert Answer
R?esistivity and resistance? ??o?f? ?a? ?c?o?n?d?u?c??t?o?r? are two diff. thi?n?g?s??.? Resistance is the opposition to the flow of electrons (i.e., electrical current). Every substance has a certain amount of resistance. Resistance is measured in Ohms.
??Resistivity is defined as the measure of the resistance a mat?erial imposes on current flow. ? ?
??Resistivity is defined as the measure of the resistance a mat?erial imposes on current flow. ? ?
?The ?r?e?????????sistance ?of a given length of conductor depends upon the resistivity of that material,
?th????????e length ?????of th??e conductor, and the cross-sectional area of the conductor, ?????????????????????????????
?R = ?????????? ?r L ?/?A
?where R = resistance of conductor, ?
? ?r = specific resistance or resistivi?t?y? ?????????
?L = length of conductor?,? ????
?A = cross-sectional area of conductor?The resistivity r (rho) allows different materials to be compared for resistance, according to their nature, without regard to length or area. The higher the value of r, the higher the resistance.
Answered by | 16 May, 2011, 12:12: PM
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