Question
What is Rectifier?

Answer

From the V-I characteristic of a junction diode we see that it allows current to pass only when it is forward biased. So if an alternating voltage is applied across a diode, the current flows only in that part of the cycle when the diode is forward biased.
This property is used to rectify alternating voltages and the circuit used for this purpose is called a rectifier.
A rectifier converts AC energy in to DC energy.

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