Question

Platinum resistance thermometer has a resistance of 200 at 00c. Find its resistance at 3000c if the platinum has a resistance temperature co-efficient of 0.00392 / oc. If the thermometer has a resistance of 500 , calculate the temperature

Answer 1

Answer:

The resistances are as follows :

R

0

=

2.2

Ω

R

100

=

5.6

Ω

The temperature coefficient of the platinum thermometer is

α

=

R

100

−

R

0

100

−

0

=

5.6

−

2.2

100

=

0.034

Ω

∘

C

−

1

Let the temperature of the bath be

=

θ

∘

C

R

θ

=

7.3

Ω

Therefore,

θ

=

R

θ

−

R

0

α

=

7.3

−

2.2

0.034

=

150

∘

C

hint