Originally Posted by myredracer
I don't understand how the adapter would help cool the cord. Copper wire has a fixed resistance per foot and would not change with temperature,
Ok, First how can the adapter affect it: Quality, as the adapter ages the connection between the plug (Adapters) and the outlet, (parks) is not as good.
Likewise the outlet on the adapter and your RV's plug
Second.. Nearly ALL metals, copper included, the resistance changes with temperature,, Usually as one goes up so does the other, however there are exceptions.
It is possible to make a ZTC (Zero Temp Coifficent) alloy but those are rare and expensive.