Labo Élec
electrical lab simulator
Exercise from the chapter "Ohm's law & resistance"
Level 4 of 5 · Skills: Measure, Calculate
Wire F1 is made of copper. Only its temperature can be set (inspector).
Read R at 20 °C then at 120 °C and deduce the temperature coefficient α = (Rθ − R₂₀) / (R₂₀ · Δθ).
Parametric exercise: the values change with every draw; these are one example.
R₂₀ = 1.7 Ω; at 120 °C, Rθ = R₂₀ × (1 + α × (120 − 20)); α = (Rθ / R₂₀ − 1) / (120 − 20) = 0.0039 /°C.