What is a function of a rectifier?

What is a function of a rectifier?
Irfan ahmad khan Answered First
The Rectifier is an electronic device, which converts an AC waveform(Usually a Bi-directional waveform with Zero Average value) to a Pulsating DC waveform (Uni-directional waveform with Nonzero Average value). As AC wave (Sinusoidal) has two half cycles, namely - Positive Half cycle & Negative Half cycle If a Rectifier does it's operation only in one half of the cycles, it is known as Half Wave Rectifier. Similarly, If a Rectifier does it's operation in both the half cycles, it is known as Full Wave Rectifier.
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What is a synchronous rectifier?

a circuit that emulates a diode,allowing current to pass in one direction but not the other without the losses associated with the junction

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