5 best conductors

1.silver.

2.copper.

3.gold.

4.aluminium.

5.calcium.

Copper is used in most electrical cables.

Silver is too costly to be used in electrical applications. Although gold is not as conductive as copper, it is often used for connectors. Because gold doesn't tarnish, it makes for a reliable connector.

Aluminum is used in commercial power transmission systems but it is difficult to install properly so it is almost never seen in home wiring systems.

Finally, calcium is only half as conductive as copper and reacts with air and water making it a poor choice for electrical systems.