The gain of an NPN transistor, defined as the ratio of collector current (Ic) to base current (Ib), is influenced by the operating mode of the transistor. In linear mode, where the collector is reverse biased, the collector current is β (beta) times the base current. Conversely, in switch mode, an increase in base current results in a slight decrease in collector-emitter voltage (Vce) as the collector diode begins to conduct. Understanding these principles is essential for effectively utilizing NPN transistors in electronic circuits.
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