A rod is connected at both ends to electrodes. The electric wires that connect the rod to each electrode are strong enough to carry an electric current flowing through the rod and yet thin enough for the heat transfer to be negligible. The contact resistance and the heat radiated from the rod are negligible. In these experimental conditions, an adiabatic measurement of the resistivity of the material can be performed. As Harman suggested in his seminal paper [187], experimental conditions can be found such that the Joule and Thomson heating have negligible effects. Use the empirical linear equations (11.92) to show that the adiabatic resistivity thus measured is given by,where ρ = 1/σ is the isothermal resistivity, κ is the thermal conductivity and ε is the Seebeck coefficient of the rod material.

Transcribed Image Text:

Pad =P ( 1 + / (1 + & T) кр