The temperature coefficient of resistance of a material is 0.004 / K. The resistance of a wire made of this material at 20°C is 10 ohm. At what temperature will its resistance be 12 ohm?
Q1. The temperature coefficient of resistance of a material is 0.004 / K. The resistance of a wire made of this material at 20°C is 10 ohm. At what temperature will its resistance be 12 ohm?
Answer: 70°C
Explanation: Using R = R0(1 + αΔT), we have 12 = 10(1 + 0.004 × ΔT), giving ΔT = 50, T = 20 + 50 = 70°C.