Power Electronics
Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then

  Vc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3.
 Vc1 > Vc2 > Vc3 when Ig1= Ig2
 Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.
 Vc1 = Vc2 = Vc3 any value of Ig.

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Power Electronics
Rise time is defined by the interval when

 anode voltage drops from 90 % to 10 % of its initial value.
 gate current rises from 90 % to 100 % of it final value.
 anode current rises 10 % to 90 % of its final value.
  both B and C.

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