Resistance Temperature Detectors Question

[pcdoctor]

Homework Statement

An RTD has a (wierd looking a) (20'c) = 0.004'C-1.
If R = 106 Ohms at 20'c find the resistance at 25'c

Homework Equations

R=Ro(1 + (wierd looking a)(T-To))

Answer should come to 108.12 Ohms

The Attempt at a Solution

20 / 106 = 0.1886 * 25 X

 

[George Jones]

What do you think R_0 and T_0 equal?

 

[pcdoctor]

I managed to do it in the end

Hi,

I had another go at it and i got the correct answer

Sometimes you have to look at things twice.

I cannot do this one:

A strain gauge has GF = 2.14 and a nominal resistance of 120 Ohms. Calculate the resistance change resulting from a strain of 144 um/m.
Any help would be great.

 

[George Jones]

Hi,

I had another go at it and i got the correct answer

Sometimes you have to look at things twice.

Great!

I cannot do this one:

A strain gauge has GF = 2.14 and a nominal resistance of 120 Ohms. Calculate the resistance change resulting from a strain of 144 um/m.
Any help would be great.

What is the relevant equation? Once you have this, I think it's just a matter of plugging in the numbers.