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Define input resistance, output resista...

Define input resistance, output resistance and current amplification of a transistor.

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Input resistance : It is the ratio of change in base-emitter voltage and the corresponding change in base current at constant collector-emitter voltage.
i.e., `R_"in"=((DeltaV_(BE))/(DeltaI_B))` at constant `V_(CE)`
Output resistance : It is the ratio of the change in collector-emitter voltage to the corresponding change in collector current at a constant base current.
i.e., `R_"out"=((DeltaV_(CE))/(DeltaI_C))` at constant `I_B`
Current amplification : It is the ratio of change in collector current and the change in base current at constant collector -emitter voltage when the transistor is in active state
`beta_(ac)=((DeltaI_C)/(DeltaI_b))` at constant `V_(CE)`
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