Which of the following describes a dual-voltage secondary in a transformer?

A dual-voltage secondary in a transformer refers to a configuration where the transformer is designed to provide two separate voltage outputs. These outputs are typically different voltages, allowing for versatile applications in electrical systems. The ability to choose between various voltages can be essential for supplying different equipment or circuits that operate at distinct voltage levels.

This setup is particularly useful in scenarios where a single transformer can serve multiple needs, improving efficiency and reducing the need for several transformers. Whereas other options describe different configurations or outputs—like a single voltage output or multiple outputs of identical voltages—they do not accurately capture the essence of what a dual-voltage secondary entails.

Understanding transformer configurations is critical for electricians, as it helps in selecting the right transformer for specific applications, ensuring compatibility with connected equipment.