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From Wikipedia:If one were making an electrical device it would be better design to plate it with silver, a good conductor, rather than gold, a poor conductor.
Electronics. The concentration of free electrons in gold metal is 5.90×1022 cm-3. Gold is highly conductive to electricity, and has been used for electrical wiring in some high energy applications (silver is even more conductive per volume, but gold has the advantage of corrosion resistance). For example, gold electrical wires were used during some of the Manhattan Project’s atomic experiments, but large high current silver wires were used in the calutron isotope separator magnets in the project.