What are the names of the electrodes of a bipolar junction transistor?

• A. Emitter, base, and collector
• B. Anode, cathode, and gate
• C. Source, drain, and bulk
• D. Collector, emitter, and diode

Answer: (A)

The electrodes of a bipolar junction transistor (BJT) are indeed identified as the emitter, base, and collector. Each plays a crucial role in the function of the transistor.

The emitter is responsible for injecting charge carriers (electrons or holes) into the base, which is typically thin and allows for easy movement of these carriers. The base controls the flow of charge carriers between the emitter and collector, serving as an interface that modulates the transistor's operation. The collector collects the charge carriers from the base and delivers them to the output circuit. This arrangement allows BJTs to function effectively as amplifiers or switches in electronic circuits.

The other options mention electrodes relevant to different types of devices. Anode, cathode, and gate are associated with devices like diodes, field-effect transistors, and other semiconductor components, while source, drain, and bulk are terminology used for field-effect transistors. The term "diode" in the last option does not relate to the configuration of a BJT. Understanding these distinctions is key in recognizing how BJTs operate distinctively from other components in electronic circuits.