12 volt power supply 10 amp A 12 volt power supply with a 10 amp rating is a device that converts AC (alternating current) power from a wall outlet into DC (direct current) power with a voltage output of 12 volts and a current rating of up to 10 amps. This type of power supply is commonly used in applications that require a higher current draw, such as LED lighting installations, motor control systems, and audio amplifiers.