Which two metals are commonly used as electrical conductors?

Which two metals are commonly used as electrical conductors?

• A. Copper and Aluminum
• B. Iron and Nickel
• C. Zinc and Lead
• D. Tin and Titanium

Answer: (A)

Electrical conduction in metals relies on free electrons moving readily through the metal. For wiring, you want a metal with high conductivity, good ductility, and reasonable cost. Copper and aluminum fit that best. Copper provides the highest overall conductivity among common metals, is very ductile (easy to draw into wires), and resists corrosion well enough for most uses. Aluminum is lighter and cheaper, which makes it attractive for long runs or large cables, and it conducts well enough to be used widely, though its conductivity per cross-section is about 60% of copper’s. The other options don’t match as well. Iron and nickel have lower conductivity and iron tends to corrode, while nickel is less common for general wiring. Zinc and lead are poorer conductors for typical electrical applications. Tin and titanium are either not as conductive or are used for other properties (tin mainly as solder or coating; titanium is strong and corrosion-resistant but expensive and not a standard conductor). So copper and aluminum are the metals most commonly used as electrical conductors.

Electrical conduction in metals relies on free electrons moving readily through the metal. For wiring, you want a metal with high conductivity, good ductility, and reasonable cost.

Copper and aluminum fit that best. Copper provides the highest overall conductivity among common metals, is very ductile (easy to draw into wires), and resists corrosion well enough for most uses. Aluminum is lighter and cheaper, which makes it attractive for long runs or large cables, and it conducts well enough to be used widely, though its conductivity per cross-section is about 60% of copper’s.

The other options don’t match as well. Iron and nickel have lower conductivity and iron tends to corrode, while nickel is less common for general wiring. Zinc and lead are poorer conductors for typical electrical applications. Tin and titanium are either not as conductive or are used for other properties (tin mainly as solder or coating; titanium is strong and corrosion-resistant but expensive and not a standard conductor).

So copper and aluminum are the metals most commonly used as electrical conductors.