Define amplification factor and drain resistance, Electrical Engineering

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Q. Define amplification factor, drain resistance and transconductance and derive the relationship between drain resistance and trans conductance?

Drain resistance

It is the ratio of change in drain-source voltage (?VDS) to the change in drain current ?ID) at constant gate-source voltage ie ac drain resistance r_d = ΔV_DS / ΔID at constant V_GS.

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