A bridge rectifier is a specific arrangement of diodes that is most often used to convert an alternating current input into a direct current output. Because all electronics require direct current, bridge rectifiers are present in almost all types of electronics. Bridge rectifiers make use of a specific arrangement of at least four diodes configured into a bridge circuit, and they provide the same output polarity no matter the input polarity. Bridge circuits come in many different types, sizes and voltages, and are an essential part to the power supply of almost all electronics. Bridge rectifiers are lower in weight and cost than other products that perform the same task.