Question

Unit of Peltier coefficient is

• A. $J{C}^{-1}$
• B. $J{A}^{-1}$
• C. $J{V}^{-1}$
• D. $J{K}^{-1}$

Answer 1

Answer: (A)

$J{C}^{-1}$

Peltier coefficient is the energy absorbed or evolved when a unit current flows across a junction for one second. The symbol $\pi$ is used and when a current I flows for a time t at the junction, then we represent the heat produced as

$W=\pm \pi It$

$\therefore$ Peltier coefficient $\pi =\frac{W}{It}$ and is numerically equal to the emf set up at the junctions and the unit is Joule/Couloumb $\left(J{C}^{-1}\right)$. hence option A is correct.