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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.

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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