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 ,themn the electric potential difference is proportional to dT dV α dT
    or
    dV=σdT
    where σ is the constant of proportinality and is known as thomson coefficent

  • Peltier coefficent and thomson coeficent are related to thermopower 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 coefficent namely seaback,peltier and thomson coefficent but the basic quantity is thermo-power which is the rate of change of thermo-emf with temperature
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