TRIACs are used in different types of applications like speed controls for electric fans, light dimmers, and other electric motors, and in the modern computerized control circuits of many household small and major appliances.

The Triac mainly consists of three terminals, Main Terminal 1 (MT1), Main Terminal 2 (MT2), and Gate (G). and Four Layers.

Triac is an AC controlled, bidirectional device. If the application requires current flow in only one direction, a diode is connected in series to the gate to convert the AC voltage to DC.

Triac is a bidirectional device because it allows current to flow in both directions.

Advantages of an AC-AC converter that uses a triac include: Controlling triacs is simple when utilizing low-power electrical devices like microcontrollers or short triggering circuits.