Peltier Effect
Category : JEE Main & Advanced
When current is passed through a junction of two different metals, the heat is either evolved or absorbed at the junction. This effect is known as Peltier effect. It is the reverse of Seebeck effect. (When a positive charge flows from high potential to low potential, it releases energy and when positive charge flows from low potential to high potential it absorbs energy.)
Peltier co-efficient \[\mathbf{(\pi )}\]: Heat absorbed or liberated at the junction is directly proportional to the charge passing through the junction i.e. \[H\propto Q\Rightarrow H=\pi Q;\] where \[\pi \] is called Peltier co-efficient. It's unit is J/C or volt.
Peltier co-efficient of a junction is the amount of heat absorbed or liberated per sec. When 1 amp of current is passed to the thermo couple.
It is found that \[\pi =T\frac{dE}{dT}=T\times S\]; where T is in Kelvin and \[\frac{dE}{dT}=P=\] Seebeck coefficient S
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