The transformer forms the basis of all ac power-distribution systems. In the most basic definition, a transformer is a device that magnetically links two or more circuits for time-varying voltage and current. Magnetic coupling has a number of intrinsic advantages, including:
- DC isolation between the circuits
- The ability to match the voltage and current capability of a source to a load on the
other side
- The ability to change the magnitude of the voltage and current from one side of
the transformer to the other
- The ability to change the phases of voltage and current from one side of the device to the other
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