What actually makes copper busbar a good conductor, however, is how some of its electrons are easily detached. When the outer electrons detach, it allows for a chain reaction of electrons.
The chain reaction is created by one electron moving through a circuit, which in turn makes each electron, in the circuit detach (i.e. chain reaction). As each electron is detached, electricity is allowed to function. Since electrons copper conductor detach easier than most other conductors, electricity easily functions through a copper circuit. This is what really makes copper such a good conductor.
Thus copper is a better conductor than most, however, silver is a better conductor. Copper is still chosen over silver because of copper being much more inexpensive than silver. Some devices require the better conductor but copper is, by far, the highest chosen conductor.
Copper is an extremely better conductor than aluminum. Usually aluminium is cheaper than copper and is therefore, used when expense is the most important component.
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