Transformer winding refers to several turns of a copper coil that is wound around the laminated section of the magnetic core of a transformer. The winding to which the supply voltage is connected is called the primary winding of a transformer and the winding to which the load is connected is called the secondary winding of a transformer. 

There are two main types of windings in a transformer:

• Primary winding: The primary winding receives electrical power from an input source, such as an electrical grid or a power supply. When an alternating current (AC) flows through the primary winding, it generates a changing magnetic field in the transformer's core.
• Secondary winding: The secondary winding is another set of coils wound around the transformer's core. The changing magnetic field induced by the primary winding causes an electromagnetic induction in the secondary winding. This induction results in the generation of a voltage or current in the secondary winding, allowing the transformer to step up (increase) or step down (decrease) the voltage depending on the turns ratio between the primary and secondary windings.

The number of turns in the windings, their arrangement, and the material used for the core impact the transformation ratio and efficiency of the transformer. The winding ratio determines how much the voltage is stepped up or down, enabling transformers to adapt electrical energy for various applications in power distribution, transmission, and electrical systems.

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