Rectifier
A device which convert alternating current or voltage into direct current or voltage IS known as rectifier. The process of converting AC into DC IS caned rectification.
Half-Wave Rectifier
A half-wave rectifier converts the half cycle of applied AC signal into DC signal. Ordinary transformer may be used here.
Full-Wave Rectifier
A full-wave rectifier converts the whole cycle of applied AC signal into DC signal. Centre top, transformer is used here.
[ Half-wave rectifier converts only one-half of AC Into DC while full wave rectifier rectifies both halves of AC input.]
Transistor