Question
Consider the following statement regarding DIAC.
Statement (1): DIAC is unidirectional device. Statement (2): DIAC can be used for triggering TRIAC. Statement (3): DIAC can be used as an AC switch. Which statement is/are true.Solution
DIAC (Diode for Alternating Current): ● A DIAC is a bidirectional semiconductor switching device . It remains non-conducting until its breakover voltage (typically 20–40 V) is reached, after which it conducts in either direction.
● Because it works in both directions, it is widely used in AC circuits for triggering other devices like the TRIAC.
● Unlike a normal diode, it does not have polarity in conduction once triggered, making it useful as a symmetrical AC switch . Now check the statements: 1. DIAC is unidirectional device → False , because DIAC conducts in both directions (bidirectional). 2. DIAC can be used for triggering TRIAC → True , DIAC ensures sharp, symmetrical triggering for TRIACs in light dimmers, motor speed control, etc. 3. DIAC can be used as an AC switch → True , since it can conduct in both directions after breakover voltage is reached.
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