Temperature coefficient of resistance

Thread Starter

logearav

Joined Aug 19, 2011
248
The formula for temperature coefficient of resistance is
\(\alpha\) = ΔR/R0 ΔT
where R is R - R0, where R0 is the resistance at reference temperature usually at 0°C or 20°C.
ΔT is T - T0, again T is 0° or 20°C
when written explicitly we get
\(\alpha\) = (R - R0)/R0 (T - T0)
But while measuring temperature coefficient of resistance of the material of the coil, in metre bridge experiment,
we use the relation \(\alpha\) = R2 - R1/(R1t2 -R2t1).
How R1 and R2 comes in this relation, whereas in the original formula there is only R0.
 

Attachments

MrChips

Joined Oct 2, 2009
19,280
It appears that you are using equations from two different sources.
Just substitute R = R2, R0 = R1. Also T = t2, T0 = t1.
 
Top