A thermocouple is made from two metals, antimony and bismuth. If one junction of the couple is kept hot and the other is kept cold then, an electric current will
flow from antimony to bismuth at the cold junction
flow from antimony to bismuth at the hot junction
flow from bismuth to antimony at the cold junction
not flow through the thermocouple.
As we learnt in
In series Grouping -
- wherein
Equivalent Resistance
At cold junction, current flow from Antimony to Bismuth (because current flows from metal occurring later in the series to metal occurring earlier in the thermoelectric series.
Option 1)
flow from antimony to bismuth at the cold junction
This option is correct.
Option 2)
flow from antimony to bismuth at the hot junction
This option is incorrect.
Option 3)
flow from bismuth to antimony at the cold junction
This option is incorrect.
Option 4)
not flow through the thermocouple.
This option is incorrect.
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