Question

A strain guage has a resistance of 120.2 ohms at 20oC. Calculate its resistance at 30oC.

Answer 1

$R_0=120 ohm \\T_1=20°c\\T_2=30°c$

$R_1=?$

$R_1=R_0(1+\alpha(T_2-T_1))$

$\alpha=8\times10^{-7}\Omega/\Omega°c$

Put value

$$R_1=120\times(1+8\times10^{-7}(30-20))$$

$R_1=120\times(1+8\times10^{-7}\times(10))$

$R_1=120.61\Omega$