Power cord provided with a power cord transformer

A power cord (10) provided with a power cord transformer (12) is described. The transformer comprises a core (11) of ferromagnetic material, a primary coil (13) and a secondary coil (14) both provided around the core. The core and coils have such a shape that the distance between two points on the primary coil and also the distance between two points on the secondary coil is always smaller than twice the largest axis of the power cord cross section