As SCR is a unidirectional device, the conduction is from anode to cathode and not from cathode to anode. It conducts in both direction. It is a bidirectional SCR with three terminal.
TRIAC=TRIODE+AC
Here it is considered to be two SCRS connected in anti parallel. As it conducts in both direction so it is named as MT1,MT2 and gate G.
SALIENT FEATURES
1.Bi directional triode thyristor
2.TRIAC means triode that works on ac
3.It conduct in both direction
4.It is a controlled device
5.Its operation is similar to two devices connected in anti parallel with common gate connection.
6.It has 3 terminals MT1,MT2 and gate G
Its use is control of power in ac.
