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Class 10
Chapter 12 Class 10 - Electricity Resistance Resistivity The electrical resistance of an object is a measure of its opposition to the flow of electric current. Resistivity is the characteristic property of the material by which it resists the amount of curren t through it. It depends upon the length , area of cross-section and nature of the material of the given material, and physical conditions like temperature It only depends upon the nature of the material and physical conditions like temperature. Its SI unit is ohm (Ω) Its SI unit is ohm meter. (Ω-m) It is denoted by R . It is denoted by ρ (rho) Formula for Resistance is R = V/I, or R = ρ(L/A) where V = Voltage, I = Current, ρ = Resistivity Formula for Resistivity is  ρ = (R×A)/L where R = Resistance, L= Length, A = Cross-sectional area Resistance depends on dimensions of the material, like length, area of cross-section Resistivity is independent of the dimensions of material

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