NOVELTY - The method comprises driving a level of current generated by cells of a fuel cell (2) using a control computer (10), and driving a series of cycles of current intervals including a low non-zero current and a current interval comprising raising and lowering a strength of the current at programmed speeds if the temperature of the cells is less than 0 degrees C when starting the operation of the fuel cell. The fuel cell includes a unit for tracking a temperature of the cells. The low non-zero current is constant. The current interval has a maximum current intensity, which is constant.    USE - The method is useful for operating a fuel cell, which is useful in an electric generator and an electric vehicle (all claimed).    ADVANTAGE - The method ensures efficient operation of the fuel cell at low cost by rapid heating while preserving the service life of the cell.    DETAILED DESCRIPTION - The method comprises driving a level of current generated by cells of a fuel cell (2) using a control computer (10), and driving a series of cycles of current intervals including a low non-zero current and a current interval comprising raising and lowering a strength of the current at programmed speeds if the temperature of the cells is less than 0 degrees C when starting the operation of the fuel cell. The fuel cell includes a unit for tracking a temperature of the cells. The low non-zero current is constant. The current interval has a maximum current intensity, which is constant and corresponds to a value higher than or equal to an intensity value for which a produced electric power is maximum. A programmed speed of current intensity for the intervals is 0.1-10 A/cm2/seconds without the voltage of the cell falls below 0.3V. An average duration of the current intervals between the start of increase in intensity and the end of descent in the intensity is 5-50% of the total cycle period. The total duration of cycles of current intervals is 10-200 seconds. INDEPENDENT CLAIMS are included for:    (1) a fuel cell;    (2) an electric generator; and    (3) an electric vehicle.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a system including a fuel cell.    Fuel cell (2)    Pump (4)    Heat exchanger (6)    Control computer (10)    Power converter. (12)