Which of the following is both Latch ON and Latch OFF device Select one:a. Triac b. SCRc. GTOd. DiacQuestion 19Not yet answeredMarked out of 2.00Flag questionQuestion textThe Latching Current of a typical SCR is 30mA. What must be holding current of the same SCR. approximately...Select one:a. 60 mAb. None of the abovec. 30 mAd. 10 mA
Question
Which of the following is both Latch ON and Latch OFF device Select one:a. Triac b. SCRc. GTOd. DiacQuestion 19Not yet answeredMarked out of 2.00Flag questionQuestion textThe Latching Current of a typical SCR is 30mA. What must be holding current of the same SCR. approximately...Select one:a. 60 mAb. None of the abovec. 30 mAd. 10 mA
Solution
The first question is asking which device can be both Latch ON and Latch OFF. The correct answer is:
a. Triac
The Triac is a three terminal device similar to the SCR but it can conduct in both directions, thus it can latch both ON and OFF.
The second question is about the holding current of a typical SCR with a latching current of 30mA. The holding current is typically less than the latching current. So, the correct answer is:
d. 10 mA
The holding current is the minimum current that must pass through the SCR in order for it to remain on after it has achieved latching. It is usually less than the latching current.
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