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Measurement, Conversion and Control

Q1: Holding current for an SCR is best described as

A the minimum current required for turn-off

B the current required before an SCR will turn on

C the amount of current required to maintain conduction

D the gate current required to maintain conduction

ANS:C - the amount of current required to maintain conduction

Option A, which says, "the minimum current required for turn-off" would not be true for holding current because it is not the minimum current to turn-off but "the minimum current that would allow conduction". Technically speaking, the minimum current required for turn-off is LESS than the holding current.



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