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双极晶体管（双极结型晶体管：BJT）有哪些应用？
双极晶体管（双极结型晶体管：BJT）可通过施加至基极的电流来控制集电极电流。通常，集电极电流为基极电流乘以直流电流增益（hFE）*。正是这种增益使双极晶体管可用作放大器。鉴于双极型晶体管在饱和区和截止区中的特性，双极晶体管也用作开关。
*hFE随集电极-发射极电压而变化，具体取决于外部电路。
关于hFE的说明，另见常见问题（FAQ）：“双极晶体管的基极-发射极与集电极-发射极电压之间有何关系？”