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What is the total anode current of SCR in the equivalent circuit from the two-transistor (T1 & T2) analogy of SCR?
  • a)
    The sum of both the base currents
  • b)
    The sum of both the collector current
  • c)
    The sum of base current of T2 & collector current of T1
  • d)
    The sum of base current of T1 & collector current of T2
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
What is the total anode current of SCR in the equivalent circuit from ...
The relation between the collector current and emitter current is shown below.

 
Here, IC is collector current, IE is emitter current
Two transistor model of the SCR bisecting the SCRs middle two layers.
  • The two-transistor equivalent circuit shows that the collector current of the NPN transistor T2 feeds directly into the base of the PNP transistor T1, while the collector current of T1 feeds into the base of T2.
  • These two inter-connected transistors rely upon each other for conduction as each transistor gets its base-emitter current from the other’s collector-emitter current.
  • So, until one of the transistors is given some base current nothing can happen even if an Anode-to-Cathode voltage is present.
  • IB1 = IC2; anode current is Ia = IC1 + IB1 = IC1 + IC2 i.e. total anode current of SCR in the equivalent circuit from the two-transistor (T1 &T2) analogy of SCR is the sum of both the collector current.
  • If applied gate current is Ig then cathode current will be the summation of anode current and gate current i.e. IK = Ia + Ig
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Community Answer
What is the total anode current of SCR in the equivalent circuit from ...
And T2) model?
The total anode current of an SCR in the two-transistor model can be calculated by summing the collector currents of transistors T1 and T2.
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What is the total anode current of SCR in the equivalent circuit from the two-transistor (T1 & T2) analogy of SCR?a)The sum of both the base currentsb)The sum of both the collector currentc)The sum of base current of T2 & collector current of T1d)The sum of base current of T1 & collector current of T2Correct answer is option 'B'. Can you explain this answer?
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