is the Planck charge
is the Planck time
= permittivity in vacuum
G is the gravitational constant
c is the speed of light in vacuum.
The Planck current is that current which, in a conductor, carries a Planck charge in Planck time.
Alternately, the Planck current is that constant current which, if maintained in two straight parallel conductors of infinite length and negligible circular cross-section, and placed a Planck length apart in vacuum, would produce between these conductors a force equal to a Planck force per Planck length.