Question

A platinum resistance thermometer has a resistance of 150 Ω at 0°C. What is the resistance when the temperature is 200°C? When the thermometer has a resistance of 400 Ω, what is the value of the temperature? The resistance temperature co-efficient of platinum is 0.0039/°C.

Answer 1

α=

R

1

t

2

−R

2

t

1

R

2

−R

1

∴α=0.0025

1+αT

1

R

T1

=

1+αT

2

R

T2

∴1+αT=1.63

T=252K

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