What is the primary advantage of using AC in aircraft electric power systems?

The primary advantage of using alternating current (AC) in aircraft electric power systems stems from its ability to be easily transformed to different voltage levels using transformers. This is particularly beneficial in aircraft, where power needs can vary widely depending on the load requirements of various systems. The ability to step up voltages allows for reduced current levels, which in turn minimizes power loss and enables the use of thinner and lighter wiring. As a result, AC power systems can provide the necessary power while maximizing efficiency and minimizing weight, which is a crucial factor in aircraft design and operation.

While other options highlight certain characteristics of AC or DC power, they do not address this fundamental capability of AC transformer usage, which directly aligns with the operational needs of an aircraft's electrical system.