In a single-phase transformer with a dual-voltage secondary, the total power rating is the sum of what?

In a single-phase transformer with a dual-voltage secondary, the total power rating is indeed the sum of both secondary windings. This is because a dual-voltage secondary configuration typically consists of two separate windings that can either operate individually or together. The power rating for the transformer reflects the capacity at which these windings can safely operate under load.

When both secondary windings are used in conjunction, their combined output contributes to the overall power rating of the transformer. It is crucial to consider both windings because each one has its own voltage and current specifications that, when combined, determine the total available power output. Therefore, understanding the functioning and interrelationship of both secondary windings is essential to determine the overall performance and capacity of the transformer.