The primary difference between the triac phase controller and the SCR phase controller is the fact that the triac circuit
A) requires a higher turn-on voltage.
B) allows conduction through the load during both alternations of the input cycle.
C) requires an added UJT to operate properly.
D) allows for higher load power ratings.

Question

Quizplus · Accepted Answer

The primary difference between a triac phase controller and an SCR (Silicon Controlled Rectifier) phase controller is that a triac can conduct in both directions, allowing current to flow through the load during both the positive and negative alternations of the AC input cycle. SCR phase controllers, on the other hand, can only conduct in one direction.

The Primary Difference Between the Triac Phase Controller and the SCR