Two resistors of identical geometry are wired in series across a constant voltage source

PHYSICS · Subjective · CBSE · Physics · Current Electricity · Current Electricity

Problem

Two resistors of identical geometry are wired in series across a constant voltage source. One resistor is copper with temperature coefficient αCu=4.0×10−3 ∘ ⁣C−1\alpha_{\text{Cu}} = 4.0\times10^{-3}\,{}^{\circ}\!\text{C}^{-1}; the other is nichrome with αNiCr=4.0×10−4 ∘ ⁣C−1\alpha_{\text{NiCr}} = 4.0\times10^{-4}\,{}^{\circ}\!\text{C}^{-1}. During operation, the temperature of both resistors rises by 50 ∘ ⁣C50\,^{\circ}\!\text{C}. (a) Which resistor experiences the greater percentage change in resistance? (b) Explain how this unequal change affects the total current in the series circuit.

Related theory

Browse the problem library