Question

The thermo e.m.f. of a thermocouple is given by E = 2164t – 6.2 t². The neutral temperature and a temperature of inversion are(a) 349, 174.5(b) 174.5, 349(c) 349, 698(d) 698, 349

Answer 1

From Ohm Law,

i = E/ (R + r )

Putting the Values,

2.3 = 18 (30 + r)

2.3 = 1830r

30r = 18 2.3

r = 18/2.3 × 1/30

r = 3/11.5

Internal resistance of cell is 3/11.5 Q

Answer 2

From Ohm Law,

i = E/ (R + r )

Putting the Values,

2.3 = 18 (30 + r)

2.3 = 1830r

30r = 18 2.3

r = 18/2.3 × 1/30

r = 3/11.5

Internal resistance of cell is 3/11.5 Q