An electrical device that changes house current (120-volt AC) to low-voltage DC for operating a train A power pack contains at least a transformer, a rectifier, and speed and direction controls See Also: Alternating current Direct current
an electrical device that changes house current (115-volt alternating current) to low-voltage direct current for operating a train A power pack contains at least a transformer, a rectifier, and speed and direction controls
A usually compact, portable device that converts supply current to direct or alternating current as required by specific equipment. something that is easily carried from which a piece of electrical equipment can get power, for example a battery