Question
Draw the transfer characteristic curve of a base biased transistor in CE configuration. Explain clearly how the active region of the V0 versus Vi curve in a transistor is used as an amplifier.
Solution
The transfer characteristic curve of a base biased transistor in CE configuration is shown below: 
In the active region, a small increase of input voltage (Vi)results in a large increase in IC. The gradual increase in current is a linear phenomenon. This results in an increase in the voltage drop across RC.
