Discussion
TRIAC is a bidirectional power electronic device which contains :
Answer: C
A TRIAC contains two SCRs connected in reverse parallel.
A TRIAC behaves like two thyristors connected in inverse parallel (anti-parallel) with a common gate, built on one chip. One SCR conducts in the positive half cycle and the other in the negative half cycle, so the device can switch current in both directions, which is why it is used for AC power control such as light dimmers and fan regulators.
Two SCRs in series would conduct in one direction only. Two diodes in series cannot be triggered by a gate, and BJTs in parallel do not have the latching action of a thyristor.
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