The temperature coefficient of resistivity of a material is 0.0049 (C°)-1. By how much ΔT does...
The temperature coefficient of resistivity of a material is 0.0049 (C°)-1. By how much ΔT does the temperature of a wire made from this material have to change, in order that the resistance of the wire doubles?
Homework Answers
= Temperature
coefficient of resistivity = 0.0049 C-1
T = Change in
temperature = ?
Ri = initial value of resistance = R
Rf = final value of resistance = 2R
Final resistance is given as
Rf = Ri (1 + T)
2R = R (1 + T)
2 = (1 + T)
2 = (1 + (0.0049)T)
T = 204.08 C°
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