CBSE Class 10 Answered
2 differences between resistance and resistivity ?
Asked by Rohith Kumar | 26 Apr, 2014, 07:14: PM
Expert Answer
Resistance is the property of conductor by virtue of which it opposes the flow of electric current through it.
R = V/I
Here, R is the resistance, V is the potential difference and I is electric current
Its SI unit is ohm
Resistivity is the resistance offered by 1m length of wire of the material having area of cross section of 1 m2. It is also called the specific resistance of conductor.
ρ = R a / l
Here, ρ is the specific resistance, R is the resistance, a is the area of cross section and l is the length of the conductor.
Its SI unit is ohm-metre.
Answered by | 26 Apr, 2014, 11:42: PM
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