Gain transistor or the acquisition of the current generated by the transistor, commonly referred to as the small signal current gain, while the magnitude of the gain is written with symbols HFE. This gain value is determined when the transistor is made, and with a very diverse range. For example, type BC548 NPN transistor has a range between 110 and 800.

Under conditions of saturation, the gain is the ratio of collector current to base current, or by the equation

HFE = IC / IB

Example question:
Calculate the gain transistor in the circuit below

Calculate the gain transistor
completion:
Known value of IC = 60 mA, IB currents obtained by Ohm's law
IB = VBB - VBE / RB
IB = (6 - 0.7) V / 10 kΩ
IB = 5.3 V / 10 kΩ
IB = 0.00053 A
IB = 0.53 mA
The amount of gain or HFE = IC / IB = 60 mA / 0.53 mA = 113

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