RECTIFIERS
There are three types of Rectifiers in common usage, they are as follows.

The Half wave Rectifier.

In this type of Rectifier Circuit the Diode Simply allows current to pass for 1/2 of each AC Cycle.

There is 1 output pulse for each complete Cycle of the input voltage. The output waveform of a half-wave rectifier has a frequency equal to the Input waveform

The Full-wave Rectifier

In this type of Rectifier Circuit EACH diode allows Current to pass for 1/2 half of each AC Cycle.

There are 2 output pulses for each complete Cycle of the input voltage. The output waveform of a full-wave rectifier has a frequency equal to Twice the Input waveform.

The Full wave Bridge Rectifier.

There are 2 output pulses for each complete Cycle of the input voltage. The output waveform of a full-wave rectifier has a frequency equal to Twice the Input waveform.