We are offering here the various types of Electrical Rectifiers that is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The reverse operation is performed by the inverter. The process is known as rectification, since it straightens the direction of current. The Rectifiers are used in an adapter of a charger to convert AC to DC so that the battery can be charged. It is also used in traction, rolling stock and three phase traction motors used for running trains. The Electrical Rectifiers are very efficient and useful.