If the coils of a buck-boost transformer are connected in parallel, what is true about the voltages?

In the case of a buck-boost transformer, when the coils are connected in parallel, the output voltage remains the same as the voltage rating of the individual coils. This is due to the principles of electrical circuits in parallel configurations where voltage is consistent across all components.

The concept that when coils are connected in parallel the voltages do not add together is crucial to understanding transformer operations. Instead of added voltages, all parallel-connected coils will provide the same voltage level. Therefore, the correct understanding here indicates that the total voltage remains constant across the outputs compared to the individual voltages of the coils.

In a buck-boost transformer specifically, the purpose is to either step down (buck) or step up (boost) the voltage, but parallel connections do not create an additive effect on voltage. Rather, you sum the current capacities while maintaining the same voltage. The option that reflects this correct understanding of voltage behavior in parallel connections is the one that states the voltages remain constant.