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Copper is used because it is a good conductor. The pins are generally made of brass,

an alloy of copper, as it is harder. Fuse clips are often made of copper.

Also:

Copper is desirable in electric circuits because it's the second-best conducting metal.

The reason we don't use the first-best is on account of cost. The first-best is silver.

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Q: Why the metal copper is used in plugs?
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