Question

Assertion (A): Joules heating effect is irreversible.
Reason (R): Seebeck effect and Peltier effect are reversible

• A. Both A and R are true and R is correct explanation of A
• B. Both A and R are true and R is not correct explanation of A
• C. A is true R is false
• D. A is false R is true

Answer 1

Answer: (B)

Both A and R are true and R is not correct explanation of A

Passing a current through a resistor causes it to heat by resistive losses. But heating a resistor does not cause current to flow through it. Hence, Joule's heating is irreversible.

In seebeck effect, temperature difference across a conductor produces potential difference while in petlier effect, potential difference across conductor causes temperature difference. Since the two process are opposite phenomenon, both of them are reversible.

There is no relation between A and R.