In transistor amplifier, base emitter junction is forward biased and collector base junction is reversed biased. The current gain is

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In a standard transistor amplifier (common-emitter configuration), the input signal is applied to the base terminal and the output is taken from the collector terminal.

The AC current gain ( $β$ ) is defined as the ratio of the change in output current (collector current, $Δ I_{C}$ ) to the change in input current (base current, $Δ I_{B}$ ) at a constant collector-emitter voltage.

$β = \frac{Δ I _{C}}{Δ I _{B}}$

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