Final answer:
Copper is often preferred over aluminum for electrical connections due to its superior electrical conductivity and ductility, facilitating more reliable connections. However, aluminum is also used due to its cost-effectiveness but requires larger diameters and careful connection techniques to mitigate issues related to its higher thermal expansion and oxidation.
Step-by-step explanation:
When choosing the order of conductors for making connections, specifically between copper and aluminum (alum), it's essential to consider their physical and electrical properties. Copper is a preferred conductor due to its excellent electrical conductivity and ductility, which allows for reliable and secure connections. However, to match the resistance per length of copper wires, aluminum conductors need to have a larger diameter, despite aluminum being a cost-effective alternative. Special attention must be taken while making connections with aluminum conductors because they have a higher rate of thermal expansion compared to copper, potentially leading to loose connections and creating fire hazards. Additionally, the oxidation layer formed on aluminum does not conduct electricity, therefore it requires specific techniques for proper connections. When using aluminum conductors, components must be compatible and designed to accommodate them.
It's crucial to note that silver, gold, and aluminum, like copper, are also excellent conductors. These materials are chosen not just for electrical applications but also in other areas such as cooking utensils because of their ability to conduct heat efficiently. Nevertheless, silver and gold are typically too expensive for general electrical wiring, whereas aluminum and copper are more commonly used. In summary, while making connections, ensure that the chosen conductors are utilized according to their respective advantages and limitations, maintaining safety and performance.