“But gold plated tungsten would have the conductivity of gold as long as it has sufficient thickness.”
This is not true...
bg, I'm surprised. Will you please elaborate?
“bg, I’m surprised. Will you please elaborate?”
When current flows through a material, with direct current it flows through the entire material. So if you had a plated coin, the outside material would have a resistivity and the inside would have a different resistivity.
ie; resistors in parallel. The equation is R total = R1 (times) R2, (divided by) R1 plus R2