The correct answer is D. Emitter, Base, Collector.
A BJT (bipolar junction transistor) is a three-terminal semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of three semiconductor regions: the emitter, base, and collector. The emitter and collector regions are heavily doped with impurities, while the base region is lightly doped. The emitter and collector regions are connected by a thin layer of base material.
When a small voltage is applied to the base-emitter junction, a large current can flow through the collector-emitter junction. This is because the base region is so thin that a small change in the base-emitter voltage can cause a large change in the collector-emitter current.
BJTs are used in a wide variety of electronic devices, including amplifiers, oscillators, and switches. They are also used in power supplies, computers, and telecommunications equipment.
The following are brief descriptions of each of the three terminals of a BJT:
- Emitter: The emitter is the region of the BJT that emits (sends out) charge carriers (electrons or holes).
- Base: The base is the region of the BJT that is sandwiched between the emitter and collector regions. It is very thin and lightly doped, which allows it to control the flow of current between the emitter and collector regions.
- Collector: The collector is the region of the BJT that collects (receives) charge carriers from the emitter.
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