Question

The current (I)-voltage (V) graphs for a conductor are given at two different temperatures T₁ and T₂.

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/(tan theta)`

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, T₂ > T₁.