Discussion
Which two-port parameter corresponds to the current gain?
Answer: A
The forward current ratio is beta in the common-emitter case, and it is the parameter that carries the device's threefold spread. The input impedance corresponds to the reflected emitter resistance, the reverse voltage ratio to the Early effect seen backwards, and the output conductance to the slope of the output characteristics. Mapping each two-port parameter onto its physical counterpart is what makes the black box description intelligible.
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