Physics - Current Electricity Question with Solution | TestHub

Resistance of a conductor

$R=\frac{\rho l}{A}$...(i)

As$\rho$depends on the material,

so R depends on the material.

According to the given formula in Eq.(i), it depends on length. Moreover resistance$\propto$temperature.

If$R_0=$resistance of conductor at$0° C,$

$R_t=$resistance of conductor at$t°C$,

and$a,\beta =$temperature coefficient of resistance, then

$R_t=R_0\left(1+\alpha t+\beta t^2\right)$

The resistance of a straight conductor does not depend on shape of cross-section.