What is one primary role of a transformer in power distribution?

The primary role of a transformer in power distribution is to step up or down voltage levels. This is essential in electricity distribution systems because it allows for efficient transmission of power over long distances. By stepping up the voltage at the generation point, less energy is lost as heat due to resistance in the lines. When power reaches its destination, another transformer steps down the voltage to a usable level for consumers. This ability to modify voltage levels safely and efficiently is critical to ensuring that electrical energy is delivered correctly according to the requirements of both the grid and end users.

The other options pertain to functions that do not describe the role of a transformer. For instance, increasing electrical resistance does not apply to transformers, as their function is not related to resistance but rather to voltage manipulation. Similarly, transformers do not convert AC to DC; that task is performed by rectifiers. Lastly, while transformers help in managing voltage, they do not regulate current flow in the way that devices like circuit breakers or fuses do. Their main purpose revolves around the adjustment of voltage levels to facilitate effective power distribution.