Question

Two conductors, one of copper and the other of iron, are connected in parallel and at 20°C carry equal currents. What proportion of current will pass through each if the temperature is raised to 100°C ? Assume α for copper as 0.0042 and for iron as 0.006 per °C at 20°C. Find also the values of temperature coefficients at 100°C.

Answer 1

Since they carry equal current at 20°C, the two conductors have the same resistance at 20°C i.e. R₂₀. As temperature is raised, their resistances increase through unequally.