Question

The resistance of the coil used in a platinum-resistance thermometer at 0°C is 3.00 Ω and at 100°C is 3.75 Ω. Its resistance at an unknown temperature is measured 3.15 Ω. Calculate the unknown temperature.

Answer 1

Dear student,

$$\begin{gathered} t=\frac{R_t-R_0}{R_{100}-R_0}\times 100 \\ t=\frac{3.15-3.00}{3.75-3.00}\times 100 \\ t=\frac{0.15}{0.75}\times 100 \\ t={20}^{0}C \end{gathered}$$

regards