Ok let me explain this better and maybe a better drawing will help. The cold plate is not just a plain pressure plate as I showed in the original drawing. It is a heat sink enclosed in an insulated environment. This will prevent changes in the temperature outside to affect the temperature at the simulation die.
As for the resistor if W = VI and I = V/R a change in R (resistance) would cause a change in “I” this will cause “W” to change. A T.E.C is less prone to “R” changes if used and installed properly.
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