The resistance (R) of a conductor,

- is directly proportional to its length (
*l*). i.e., R ∝*l*

- is inversely proportional to its cross-sectional area (A). i.e., \(R\propto\frac1A\)

- The resistance of the conductor depends upon the nature of the material.

- It changes with the temperature (T)

The corresponding relation which gives the relationship among the above-mentioned factors is given by: \(R=\rho\frac lA\). where,

ρ is the resistivity (or the specific resistance) of the conductor.

Moreover, if **α** be the temperature coefficient of the material of the wire, then the resistance of the wire at t_{2}° C is given by \(R_2=R_1\left[1+\alpha\left(t_2-t_1\right)\right]\)

Where R1 is the resistance of the wire at t_{1}° C.

Hence: l, A, ρ, α, are the factors on which the resistance of a conductor depends.