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rocco-coco asked If silver is better conductor than gold, why do they use gold for?
Silver is better conductor. Silver is cheaper. Why do some cell phone industries use gold instead silver, for example, my Nokia has gold leads on PCB, not copper. I've seen audio cables with gold wires, golden connectors. I suppose it has something to do with market tricks to make you think it's better because it's gold? I know because it's been proven that gold/silver makes no difference compared to standard copper cable in terms of music quality.
And got the following answer:
They use gold plating on connectors, as gold doesn't oxidize like most metals, which builds up an insulating layer and causes a poor connection. This is specially true of connectors or relays or switches that carry low voltage signals. Connectors/switches that carry higher voltages and currents can use cheaper materials as the higher currents burn through the oxidization film. Some connectors (ribbon cable comes to mind) use air tight connections to prevent oxidization. Are you sure re the gold leads on the PC board? on the traces, not the connectors?