When mt2 and gate is negative, Electrical Engineering

when MT2 and Gate  is Negative

In this case gate  current  flows  through P2N3 junction. Junction N1P2 forward  biased hence the triac  starts  conduction through  P1N1P2N2 layer initially. Since  the gate is  negative with respect to the  main terminal but MT1 but MT1  is negative with respect to MT2. Therefore MT1  attracts the holes  from P2  layer  through  N2 layer and triac  starts  conducting  through P1N1P2N2 layer.

809_when MT2 and Gate  is Negative.PNG

Figure When MT2 is positive and g is negative

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