How Transistor Amplifies

How Transistor Amplifies-Fig-1 shows a single stage transistor amplifier. When a weak a.c. signal is given to
the base of transistor, a small base current (which is a.c.) starts flowing.

Due to transistor action, a much larger ( times the base current) a.c. current flows through the collector load R C.

As the value of R C is quite high (usually 4 kΩ), therefore, a large voltage appears across R C. Thus, a weak signal applied in the base circuit appears in amplified form n the collector circuit. It is in this way that a transistor acts as an amplifier.

The action of transistor amplifier can be beautifully explained by referring to Fig.
10.1. Suppose a change of 0.1 V in signal voltage produces a change of 2 mA in the
collector current. Obviously, a signal of only 0.1V applied to the base will give an output
voltage level of the signal from 0.1V to 10V i.e. voltage amplification or stage gain is
100.

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