Question

a) A wire of a certain length (a=0.0065/°C) has a resistance of 4Ω (at 20°C). Find its resistance at 80°C.

Answer 1

$R=R_0(1+aΔT) \\ R = 4(1 + 0.0065 \times (80-20)) \\ R = 4 \times 1.39 = 5.56 \; \Omega$