Planck impedance

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The Planck impedance is the unit of electrical resistance, denoted by Z_P, in the system of natural units known as Planck units. The Planck impedance is directly coupled to the impedance of free space, Z₀, and differs in value from Z₀ only by a factor of 4π. If the Planck charge were instead defined to normalize the permittivity of free space, ε₀, rather than the Coulomb constant, 1/(4πε₀), then the Planck impedance would be identical to the characteristic impedance of free space.

29.9792458 Ω

where

• is the Planck voltage
• is the Planck current
• is the speed of light in a vacuum
• is the permittivity of free space
• is the permeability of free space
• is the impedance of free space

See also

• Natural units

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