A p-n junction can be used as a rectifier because it permits current in one direction only. From the above table, it is clear that the Bridge wave rectifier has 4 diodes.

What type of rectification uses four diodes?

Bridge Rectifiers use four diodes that are arranged cleverly to convert the AC supply voltage to a DC supply voltage. The output signal of such a circuit is always of the same polarity regardless of the polarities of the input AC signal.

Why do we use 4 diodes in bridge rectifier?

One significant application of diodes is to convert AC power to DC power. In the bridge rectifier, four diodes are used to design the circuit which will allow the full-wave rectification without using a center-tapped transformer.