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Factors on which the Resistance of a Conductor Depends

The electrical resistance of a wire is greater for a longer wire and less for a wire of large cross sectional area. The resistance depends on
  1. its length
  2. its area of cross-section, and
  3. the nature of its material.
By applying proportionality constant
ρ = Resistivity of a material in Ohm meter
R = Resistance in Ohm (Ω)
L = Length of wire in meter
A = Area of cross section in square meter
The factor in the resistance, which takes into account the nature of the material, is the resistivity. Since it is temperature dependent, it can be used to calculate the resistance of a wire of given geometry at different temperatures.



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