This is a device and process to generate alternating current without an external source for cell-houses in electro-winning or electro-refining of copper or other products in which the electric source consists of a conventional rectifier-transformer group that supplies continuous electrical current to the cell-house, which is connected in parallel to a device characterized by having the capacity to extract an electrical current from the cell-house for a period of time and then return it in another period of time, whether periodically or semi-periodically and without changing the average value of the electrical current, supplied to the cell-house by the rectifier-transformer. This results in an electrical current in the cell-house that is the superimposition of a continuous and alternating current. This process is designed to overcome the barrier of electric potential produced by the presence of the pure continuous electric field in cell-houses through the electric agitation of an ion-rich electrolyte.