A rectifier is a device which is used to straighten an alternating signal, transforming the alternating current into direct current.

The diode is an element that allows the passage of current in one direction only, blocking it totally from the other, and the rectifiers can be formed by the diodes.

The SCR, also called thyristors, are very similar to the diodes, with the only difference that the direct conduction occurs only following the application of a suitable trigger signal on a third terminal called gate.

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