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What is amplification? With a circuit di...

What is amplification? With a circuit diagram, explain the working of npn transistor as an amplifier in CE configuration.

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The circuit diagram of a transistor, working as an amplifer, in its `C_E` mode, is shown here.

If a small sinusoidal voltage is superimposed on the dc base bias by connecting the source of this signal in series with supply. Then the base current will have sinusoidal variations superposed on the values `I_B`. As a consequence the collector current also will have sinusoidal variation superimposed on the value of `I_C` producing in turn corresponding change in the output voltage `V_0`
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