Skin depth

 What do you understand by skin depth?

When an AC current is applied to a conductor, the current concentrates near the surface of the conductor and its strength decreases as you go towards the center of the conductor. The depth till which current flows in a conductor is called as Skin Depth.

The Skin Depth is dependent on the frequency of the current/signal and the resistivity of the material. It inversely proportional to the frequency and directly proportional to the resistivity.

The Skin Depth can be calculated using the following formula: