ASE Electrical and Electronic Systems (A6) Practice Test

Technician B is correct in stating that a rectifier bridge changes AC to DC voltage. A rectifier bridge, commonly made up of four diodes arranged in a specific configuration, is designed to convert alternating current (AC) into direct current (DC). The process involves the diodes allowing current to flow in one direction during the positive half-cycles of the AC input and blocking it during the negative half-cycles, thus producing a unidirectional flow of current that forms the basic principle of rectification.

In contrast, Technician A's assertion that a rectifier bridge consisting of six diodes changes DC to AC is inaccurate. Typically, a rectifier bridge does not generate AC from a DC source; rather, it's the opposite function that it serves. There are other devices, such as inverters, that are specifically designed to convert DC back into AC, but that is not the role of a rectifier bridge. The incorrect understanding by Technician A reflects a fundamental misunderstanding of how rectification works in electrical circuits.