A diode consists of two metal ends, the anode, and the cathode, and is able to straighten a half-wave of the current flow. By applying an alternating current flow on the anode, we can take a continuous flow on the cathode, if instead, we apply an alternating current flow, on the opposite terminal we will take a continuous flow.

The rectifier bridges are made up of four interconnected diodes able to perform a complete rectification of the alternating current and are classified according to the maximum current that they can rectify and based on the maximum power of the voltage applied.