Transistor Alpha vs Beta-difference between Alpha and Beta

This page on Transistor alpha vs beta describes difference between Alpha and Beta related to transistor.

Current Gain Alpha(α):
It is the ratio of collector current to the emitter current on no load and constant voltages. Alpha is always less than unity.

alpha = Ic/Ie
Ic = Collector current variations
Ie = Emitter current variations

It is the ratio of collector current to the base current on no load and constant voltages. Beta has value between 20 to 200 for general purpose transistors. Beta of 100 refers to flow of 1 electron from base terminal for every 100 number of electrons flow between Emitter-Collector terminals.

Β = Ic/Ib
Ib = Base Current variations

Relation between Alpha (α) and Beta (Β)

Β = α/(1-α)
α = Β /(1 + Β)

Other than current gain, voltage gain and power gain are also used.

Voltage Gain = Output Voltage/Input Voltage

Power Gain = Output Power/Input Power

CB CE CC transistor configurations

Both Alpha (α) and Beta (Β) are related to CE (common emitter) mode of transistor as shown in the figure-1 above.

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