find the temperature at which the resistance of a copper conductor?
Using R1 = R20[1 + a20(T1 - 20°C)] find the temperature at which the
resistance of a copper conductor will increase to 1 ohms
from a level of 0.8 ohms at 20°C.
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R1 = R20*(1+λ*Δt)
being λ the copper temperature coefficient (0,00426 °C^-1)
R1/R20 = (1+λ*Δt)
1.25 = (1+0,00426*Δt)
0.25 = 0,00426*Δt
Δt = 0.25/0,00426 =59°C
t = Δt +20 = 59+20 = 79°C