Although half wave rectifier have many applications in daily life, or in electronics devices but , the full wave rectifier is the most commonly used type in dc power supplies.
A full wave rectifier allows unidirectional (one way) current through the load during the entire 360° of the input cycle, whereas a half wave rectifier allows current through the load only during one half of the cycle. The result of full wave rectification is an output voltage with a frequency twice the input frequency that pulsates every half cycle of the input as shown below in Full wave rectifier Block Diagram
The number of positive alternations that make up the full wave rectified voltage is twice that of the half wave voltage for the same time interval. This average value, which is the value measured on a dc voltmeter, for a full wave rectified sinusoidal voltage is twice that of the half wave, as shown in the following formula
Vavg = 2Vp / π
where Vavg is approximately 63.7% of Vp for a full wave rectified voltage.