Transformer
Part of speech: noun
Definition: Something that transforms, changing is own or another thing's shape. A static device that transfers electric energy from one circuit to another by magnetic coupling. Their main use is to transfer energy between different voltage levels, which allows choosing most appropriate voltage for power generation, transmission and distribution separately. A robotic shape-changing alien from the popular sci-fi series.
Substation
Part of speech: noun
Definition: A site where electricity supplied by long-distance (high-voltage) transmission lines is transformed and/or regulated for local (low-voltage) distribution.A satellite police station serving one neighborhood or part of a larger jurisdiction.