# Skin depth calculator

 Material Aluminium 20°C Copper 20°C Brass 20°C Stainless steel 20°C Stainless steel 1000°C Nickel 20°C Carbon steel 20°C Carbon steel 1000°C Silver 20°C Gold 20°C Custom Resistivity Ωm μΩm μΩ cm Ωmm²/m Relative permeability Frequency Hz kHz MHz GHz Nefunguje Javascript

As alternating current passes through a conductor, the highest current density occurs on the surface of the conductor and decreases exponentially toward the center. This phenomenon is called the skin effect. The skin depth is the distance at which the current density drops to 1/e (about 0.368) of the surface density. 86.5% of the heat caused by the passage of current is generated in the skin depth.

Equation for calculating the skin depth:

$\delta =\sqrt{\frac{\rho }{\pi f \mu_{0} \mu_{r}}}$

where:
$\delta$ [m] is skin depth
$\rho$ [Ωm] is resistivity
$f$ [Hz] je frequency
$\mu_{0}$ is vacuum permeability (4π×10-7 Hm-1)
$\mu_{r}$ is relative permeability

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