13. A coil of wire has a resistance of 38.0 Ω at 25 °C and 43.7 Ω at 55 °C. What is the temperature coefficient of resistivity?

 

Resistance with temperature dependence is found from using temperature dependence of the resistivity.

 

Usually the reference temperature is 20 °C, ρ0 is the resistivity at 20 °C, but it can be any temperature you know the resistivity at.

 

 

 

 

Again, we need to know what the resistance R0 is at the reference temperature T0.  Here we can use the 25 °C as our reference temperature.  Since we know RT, R0, T, and T0  we can solve for a

 

 

 

 

 

 

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This page last updated on June 14, 2018