Discussion
The current gain 'β' for a transistor is defined as :
Answer: A
The current gain is \(\beta = I_{C}/I_{B}\).
\(\beta\) is the common-emitter current gain: the ratio of collector current to base current. Typical values run from about 50 to several hundred.
\(I_{C}/I_{E}\) is \(\alpha\), the common-base current gain, which is slightly less than 1. The two are linked by \(\beta = \frac{\alpha}{1-\alpha}\). \(I_{B}/I_{C}\) and \(I_{B}/I_{E}\) are the reciprocal-type ratios and are much smaller than one, so neither is a gain.
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