Question

Define current gain in common base configuration and common emitter configuration. Establish a relation between the two.

Answer 1

The current gain of the common base configuration is the ratio of change in collector current to change in emitter current when base to collector voltage is constant. This current gain is mostly close to unity.

                                                           β=∆Ic/∆Ie

The current gain of the common emitter configuration is the ratio of change in collector current to change in base current when emitter to collector voltage is constant.  

                                                           β=∆Ic/∆Ib

Both gains have numerator same but denominator different.

Answer 2

Answer:

Generally common-base current gain in a transistor is close to unity.

Explanation:

The current gain for the common-base configuration is represented as change between the collector current and emitter current when there is constant base-to-collector voltage.

                                       β=∆Ic/∆Ie

The current gain of the common emitter configuration is represented as change between the collector current and base current when emitter to collector voltage is constant.

                                       β=∆Ic/∆Ib

Relation between the two current gain is that they both include change in collector current and changes in base (emitter current and base current) control the current in both the configuration.

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