I-V characteristic of the TRIAC. The low and high impedance states are denoted as ON and OFF, respectively. If the anode of the TRIAC is positively biased against the cathode, the ‘+’ sign is used; else, the ‘−’ sign is adopted. The bidirectional arrows indicate the switching from one state to the other in accordance to the signal applied to the gate.
Menard et al. Nanoscale Research Letters 2012 7:566 doi:10.1186/1556-276X-7-566