Question

In the Figure below, the current-voltage graphs for a conductor are given at two different temperatures, T₁ and T_2.

 

1. At which temperature T₁ or T₂ is the resistance higher?
2. Which temperature (T₁ or T₂) is higher?

Answer 1

(a) For the I-V graph, the slope of the I-V graph gives the conductance

`R = "V"/"I" = 1/tanθ`

Since θ₁ > θ₂

tan θ₁ > tan θ₂

So Resistance at T₁ < Resistance at T₂

(b) Since the resistance of a conductor rises with temperature and ‘R’ at T₂ is higher than ‘R’ at T₁, so T₂ > T₁