Power Electronics
Spread time is defined as the interval during which

 both (A) and (B).
  anode current rises from 90 % to its final value.
 anode current rises from 10 % to 90 % of its final value.
 anode voltage drops from 10 % of its initial value to zero.

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Power Electronics
SCR will be turned off when anode current is

  both (A) and (B).
  < latching current but greater than holding current and gate signal is 0.
 < latching current but greater than holding current and gate signal is present.
 less than holding current.

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