Which better half wave rectifier or full wave rectifier ?

Answer 1

I'm not sure what you mean by "better". In some applications a half wave rectifier is entirely adequate, and could be said to be better because it is cheaper.

However, a full wave rectifier is better in the sense that the output waveform is much easier to filter.

The output voltage from the half wave rectifier is a sinusoidal waveform with the negative half cut off. You've only got a voltage half the time. On the other hand, the voltage from the full wave rectifier is also a sinusoidal waveform but with the negative half flipped so that you've got a continuous series of positive pulses. This is much easier to filter to a flat DC, especially when you've got a higher current load.

If you've got three phase power, as in airborne applications, using a full wave rectifier on each phase produces an output voltage that is already pretty flat. This is because the waveform would look like three single phase full wave waveforms overlaid on top of each other but separated by 120° for one and 240° for the other.

Answer 2

a half wave rectifier is cheaper, but less effecient, and does not give as good power. it also gives a lower voltage which you may want....
a full wave rectifier is more effecient and gives better power, but is more expensive. both are common.
it depends on how close you want output voltage to be to the secondary of your transformer.

Answer 3

Full Wave
http://en.wikipedia.org/wiki/Rectifier#Full-wave_rectification

Answer 4

ofcourse full wave rectifier , as it convert full wave into positive cycle where as in half wave rectifier only posive half wave is coverted into useful output.

thus it gives low power output, low power voltage

Answer 5

use google you noob