Electronics - Thyristors and Tranducers - Discussion



[A]. can trigger only on positive gate voltages
[B]. can trigger only on negative gate voltages
[C]. cannot be triggered with gate voltages
[D]. can be triggered by either a positive or a negative gate voltage

Answer: Option D


No answer description available for this question.

Meghana said: (Sep 20, 2011)  
The triac is a three-terminal ac switch that is triggered into conduction when a low-energy signal is applied to its gate terminal. Unlike the SCR, the triac conducts in either direction when turned on. The triac also differs from the SCR in that either a positive or negative gate signal triggers it into conduction. Thus the triac is a three terminal, four layer bidirectional semiconductor device that controls ac power whereas an SCR controls dc power or forward biased half cycles of ac in a load.

Hareeshkumar said: (May 8, 2016)  
I agree with you @Meghana.

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