The Basics of Transformers - By raising and lowering voltage levels, transformers make power systems versatile

摘要

When alternating current (AC) prevailed over direct current (DC) in the late 1800s, one of the deciding factors was the need for voltage levels to be raised and lowered throughout the power system to make the system efficient and safe. There is no simple way of changing DC voltage levels. Because of its time-varying magnetic field, the AC system allows the use of the transformer to change voltage levels as needed.