Thomson effect
Thomson effect
- Thomson effect is related to the emf that develops between two parts of the single metal when they are at different temperature
- Thus Thomson effect is the absorption or evolution of heat along a conductor when current passes through it when one end of the conductor is hot and another is cold
- If two parts of the metal are at small temperature difference dT ,then the electric potential difference is proportional to dT
dV α dT
or
dV=σdT
where σ is the constant of proportionality and is known as Thomson coefficient
- Peltier coefficient and Thomson coefficient are related to thermo-power according to following relations
π=Ts=T(dE/dT)
and σ =-T(ds/dT)=-T(d2E/dT2)
- We have seen that all the three effects are defined in terms of three coefficient namely Seaback,Peltier and Thomson coefficient but the basic quantity is thermo-power which is the rate of change of thermo-emf with temperature
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