![]() Similarly common-base current gain is a ratio between collector current and emitter current.The common-emitter current gain is a ratio between collector current and base current. This is called Beta, denoted by ß, and more often than not ranges between 20 to 1000, however, the standard value is taken as 200. Two current gain factors: common-emitter current gain and common-base current gain play a vital role to determine the characteristic of the transistor.The collector is made physically larger than the base for two reasons: allowing a collector to deal with more heat without damage and increasing the chance of carriers that enter the collector terminal. ![]()
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