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physical significance of alpha in an amplifier

Question asked by pratap singh, upendra in #Coffee Room on May 21, 2013
pratap singh, upendra
pratap singh, upendra · May 21, 2013
Rank C2 - EXPERT
hello friends,

what is the physical significance of the variable alpha in a transistor amplifier. Of course it represents the ratio of collector current to emitter current but what is the information that we actually derive out of this variable.

regards,
proffy Posted in: #Coffee Room
Anand Tamariya
Anand Tamariya · May 21, 2013
Rank B2 - LEADER
Helps in designing your electronic circuit. You can figure out how much base current is required to operate a load with certain current requirement or vice-versa.
Jeffrey Arulraj
Jeffrey Arulraj · May 22, 2013
Rank A2 - PRO
Alpha parameter relates Ie and Ic. And based on the Alpha value of the transistor we go for the approximation Ic=Ie

If alpha is small we can't go for this assumption

alpha is almost unity for BC107 and some low power transistors But it is not so for Power transistors

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