NOVELTY - The system has a direct current (DC) motor (16) coupled to an axle (100) of a vehicle when the vehicle is to be driven at speed less than threshold. A battery (14) powers the DC motor when the DC motor is coupled to the axle of the vehicle. A switcher (12) is coupled to the DC motor, the battery, an alternating current (AC) motor (42), an AC generator (40) and a rheostat i.e. accelerator (18) for uncoupling the battery from the DC motor and coupling the AC generator to the AC motor via the rheostat when the vehicle is driven forward at the speed greater than the threshold.    USE - System for powering vehicle i.e. electric vehicle. Can also be used for a hybrid vehicle and a fuel cell vehicle.    ADVANTAGE - The system avoids the usage of gasoline or other fossil fuel for the vehicle. The system reduces both air and noise pollution. The complex gear and drive train mechanisms are virtually eliminated as the axles are directly driven by the rotating components of the DC or AC motors. The system adapts to different motor and generator configurations. The different elements of the system can be positioned for optimum efficiency depending on the vehicle type, application and the environment. The AC generator can be mechanically or electronically subtracted from the system when the vehicle is operating on the DC power to minimize drag on the system operating at low speed. The enablement/disablement of the system can be controlled manually or automatically. The low speed-to-high speed threshold can be changed to suit user preferences, driving applications, environments, or habits. The setting of the threshold is factory set, user-controlled, government-controlled, or even automatically adjusted.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of an alternating current/direct current electric power system.    Switcher (12)    Battery (14)    Direct current motor (16)    Accelerator (18)    Alternating current generator (40)    Alternating current motor (42)    Axle (100)