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Rectifier is used to convert AC voltage source into a DC voltage by blocking the negative voltage or by changing the sign of negative voltage.

It is used in AC to DC adapters used for home appliances.

Zener diode is used to regulate power supply.  Large fluctuations of current are taken by zener diode without changing much of the voltage at its output.  It is used as a protector for all house hold appliances like TV, refrigerator.

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