FAA Powerplant Written Practice Test

What is a common disadvantage of using aluminum as a conductor?

1. Higher cost compared to copper

2. More prone to corrosion

3. Excessive weight

4. Low tensile strength

The correct answer is: More prone to corrosion

Aluminum is indeed more prone to corrosion compared to other materials, particularly copper. This characteristic is particularly significant in electrical applications because corrosion can lead to increased resistance at the connections and reduced overall conductivity. Aluminum naturally forms a thin oxide layer when exposed to air, which can protect it to some extent, but in environments with high humidity, pollutants, or salt, the oxide layer can become compromised, leading to accelerated corrosion. This factor makes aluminum less desirable in certain applications where longevity and reliability are critical. It requires special coatings, treatments, or careful handling to mitigate these corrosion concerns, further complicating its use as a conductor in various environments.