Which concept defines the role of the power transformer as an enabling technology for modern electrical grids?
Answer
The efficient transfer and conversion of voltage levels across isolated circuits
The transformer allows utilities to decouple the voltage of the power source from the voltage used by consumers. By using high-voltage transmission and low-voltage distribution, the transformer enables centralized power generation at remote sites and safe, efficient electrical delivery to widely dispersed homes and factories.

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History of Power Transformers - YouTube
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