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Define the dynamic output resistance of ...

Define the dynamic output resistance of a transistor amplifier in common - emitter configuration.

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For a constant base current `I_B`, the dynamic output resistance `(r_0` is defined as the ratio of the differential change in the collector-to-emitter voltage `(DeltaV_(CE))` to the corresponding change in the collector current `(DeltaI_C)`.
`r_0-((DeltaV_(CE))/(DeltaI_C))I_B`=constant
Note:- the dynamic input resistance, `r_i=((DeltaV_(BE))/(DeltaI_B))V_(CE)`=constant.
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