Question

What is the effect of temperature on the resistance?

Answer 1

Temperature dependence of resistance:

1. The resistance of a material is defined as the ratio of the applied voltage to the current flowing through it. The $ohm$ is the unit of resistance.
2. Resistance of material depends upon temperature by this condition, $R_t=R_0\left(1+\alpha ∆T\right)$
3. Here,

$R_0$ is the resistance at $0°C.$

$R_t$ is the resistance at $t°C.$

$\alpha$ is the temperature coefficient of resistance.

The effect of temperature on the resistance:

1. $\alpha$ is of a positive nature for conductors. As a result, the resistance of a conductor increases as the temperature rises.
2. Insulators have a negative temperature coefficient of resistance. Therefore, by increasing the temperature of the insulators, the resistance decreases.