What is the advantage of a 400 Hz electrical system in an aircraft?

A 400 Hz electrical system in an aircraft offers the significant advantage of allowing for smaller and lighter components. This is primarily because the higher frequency enables electrical equipment and power distribution systems to be designed with reduced size and weight compared to systems operating at lower frequencies, such as the typical 50/60 Hz systems commonly found in commercial power grids.

At 400 Hz, transformers, motors, and other electrical components can be made smaller for the same power output, which is critical in aircraft design where weight savings are crucial for performance, fuel efficiency, and payload capacity. Lighter components help improve overall aircraft performance and allow for more efficient use of space.

While the other options may have their benefits, they are not primary advantages related to the frequency of the electrical system in aircraft. For instance, 400 Hz does not significantly increase battery life or enhance communication systems; rather, it primarily affects component size and weight. The aspect of voltage transmission is also generally more related to the design of the system rather than the frequency used.