The magnetic resonant coupling (MRC). The method is based on the induction principle: a primary coil („transmitter“) generates a magnetic field in the secondary coil („receiver“), which leads to a voltage. Unlike the classic transformers at WPT is, that the primary and secondary coil are physically separated by the transmission path, whereby the magnetic coupling between the coil is low. This reduces the induced voltage in the secondary coil, and thus, in comparison to the transformer, reduces the power transfer. A significant difference between IPT and MRC is, that by means of MRC the voltage loss can be kept low. This is realized by the circuit measure (inserting capacity) in the secondary circuit, which leads to an oscillating circuit. An oscillating circuit has a higher current flow, which has an higher voltage at a given load. Thus the efficiency rises in comparison to a non-resonant transmission.