Question

the resistance of a resistance thermometer has values 2.71 and 3.70 ohm at 10°c and 100°c.The temperature at which the resistance is 3.26ohm is
a) 40°c
b) 50°c
c) 60°c
d) 70°c​

Answer 1

Answer:

At temperature T1 = 10 C the resistance R1 = 2.71 Ohms

At Temperature T2 = 100 C the resistance R2 = 3.70 Ohms

The increase in resistance is = 3.70- 2.71 = 0.99

The increase in Temperature is = 100–10 = 90 C

The co-efficient Ratio is = 0.99/90 = 0.011 Ohms Per Degree C

The change from 2.71 to 3.26 is = 3.26–2.71 = 0.55 Ohms

The temperature Change required is =0.55/0.011 = 50

Actual temperature is 10 + 50 = 60 C

At 60 degree C the Resistance will be 3.26 Ohms