In this project, the power transfer and the coupling between two partially coupled coils using a ferrite core were studied. Some approaches of the magnetic parameters that define the coupling between the coils were done by analytical calculations and also by simulations with FEMM. Then, the system was assembled, and some real measurements were taken, so the calculations that were done previously were checked with the values obtained by the real measurements. To finish, some measurements more were done to check the influence of the design parameters, air gap, number of turns and frequency, in the system. The general conclusions of checking the analytical calculations with the values obtained by the real measurements are that it is possible to achieved tolerable approaches with simple calculations. Regarding the real measurements, it was found that when the frequency was varied and the other parameters were fixed, the maximum efficiency, 18 %, is achieved working at 50 kHz and with a load resistance around 40 Ω. When the number of turns was varied keeping the other parameters fixed, it was found that the greatest efficiency, 23%, is achieved with 20 turns and using a load resistance of approximately 20 Ω . _________________________________________________________________________________________________________________________