Skin effect is a phenomenon that occurs in transformers and other electrical devices. It causes the flow of current to concentrate near the surface of a conductor, reducing the effective cross- sectional area of the conductor. This can cause increased resistance and heat generation. This presentation will explore the mysteries of skin effect in transformers. What is Skin Effect? Skin effect is the tendency of high- frequency current to flow near the surface of a conductor. This is due to the inductive reactance of the conductor, which increases with frequency. As a result, the current density near the surface of the conductor is higher than in the core, causing increased resistance and heat generation. Skin effect is a major concern in high-frequency transformers and other electrical devices. Causes of Skin Effect Skin effect is caused by the inductive reactance of a conductor, which increases with frequency. This causes the current to concentrate near the surface of the conductor, where the permeability of the material is lower. The effect is more pronounced in copper and other highly conductive materials. Skin effect can also be influenced by the shape and size of the conductor, as well as the magnetic field surrounding it.