What is an advantage of using 115 volts, 400 hertz alternating current?

The choice that highlights an advantage of using 115 volts, 400 hertz alternating current is related to the reduced wire size and weight. When operating at a higher frequency, such as 400 hertz, it allows for the use of smaller wire sizes to carry the same amount of power compared to lower frequencies. This is due to the skin effect, where higher frequencies cause electrical current to flow near the surface of the conductor, effectively reducing the cross-sectional area needed for the same power delivery.

In aerospace and other applications where weight is a critical factor, using 400 hertz power systems means that lighter, more compact wiring can be used. As a result, this advantageous feature leads to decreased overall weight of the electrical system, contributing to improved performance and efficiency in aircraft designs.

While other options may present valid points regarding electrical properties or safety, the direct benefit of reduced wire size and weight is a significant driver for the adoption of 115 volts, 400 hertz systems in practical applications.