The triac, like the SCR, must be phase shifted if complete control is to be gained over the AC voltage applied to it.

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The triac, similar to the SCR, requires phase shifting to achieve complete control over the AC voltage applied to it because it allows for control of the point within the AC cycle at which the triac is triggered, thereby controlling the amount of power delivered to the load.

The Triac, Like the SCR, Must Be Phase Shifted If