What is one of the primary purposes of transformers in a power distribution system?

The primary purpose of transformers in a power distribution system is to change voltage levels. Transformers are used to either step up or step down voltage from one level to another. In power distribution, high voltages are often generated for efficient transmission over long distances, as higher voltages result in lower current levels, which minimize energy loss through resistance in the conductors. Upon reaching the distribution points, transformers reduce the voltage to safer levels suitable for local usage in homes and businesses.

This capability to adjust voltage levels is crucial in ensuring that electrical power can be efficiently transmitted and safely delivered to end-users without causing damage to devices or posing safety hazards. The other options, while related to electrical systems, do not accurately represent the main function of transformers. For instance, converting AC to DC is typically handled by rectifiers, while filtering electricity requires different types of components, and generating electricity is the role of power plants, not transformers.