The wire of a platinum resistance thermometer has d ...
The wire of a platinum resistance thermometer has d resistance of 3.5Ω at 0 °C and 10.52Ω at 100°C. Calculate the temperature of the wire when its resistance is 7.5Ω.
78 °C
25 oC
30oC
57 oC
Correct answer is D
Using the formula
t = R−R0R(100)−R0×100oC
t = 7.5−3.510.5−2..5×100oC
= 47×100
= 57.14oC
~ 57oC