What is a common use of power transformers in electrical systems?

Power transformers play a crucial role in electrical systems primarily by regulating voltage levels for transmission. In power distribution networks, they are used to step up (increase) or step down (decrease) voltage levels as electricity travels from power plants to consumers. High voltage is employed for long-distance transmission to reduce energy losses that occur due to resistance in the conductors. Once the electricity reaches the vicinity of the end-users, transformers lower the voltage to safe levels suitable for residential or industrial use.

This functionality is vital for maintaining efficient and stable electrical supply systems, ensuring that voltage levels remain within required limits to avoid damage to equipment and to ensure safety for consumers.