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PennStateFan1
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Homework Statement
A copper coil has a resistance of 0.541 Ω at room temperature. What is its resistance when it is cooled to -131.3 °C?
Homework Equations
Ri=New resistance
R0=initial resistance
a=alpha
Ri=R0+R0(a(temp change))
temp change is positive when it goes up
alpha is 4.3E-3 in the book, so that is the right value
Room temp is 20 degC
The Attempt at a Solution
Ri=.541+.541(.0043)(-151.3)
Ri=.189031 ohms
I really feel like I'm doing this right and for all I know the homework program is wrong.