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Difficulty: EasyTransistors

In a standard bipolar junction transistor (BJT), which terminal receives the small input control current that regulates the larger current flow between the remaining two terminals?

  1. A
    Collector
  2. BaseAnswer
  3. C
    Emitter
  4. D
    Gate

Answer

The base terminal is the control electrode that receives the small input current in a bipolar junction transistor.
In a bipolar junction transistor (BJT), the base terminal is the thin middle semiconductor layer that controls the flow of charge carriers. Injecting a small base current allows a much larger current to flow from the collector to the emitter (or vice versa in PNP transistors), making the base the primary control terminal.

Step-by-Step Solution

1
Identify the three terminals of a bipolar junction transistor (BJT) and their basic functions.
A BJT consists of an emitter, a base, and a collector.
Recognizing the standard terminal configuration is essential for analyzing transistor operation.
2
Determine which terminal acts as the input control mechanism for current regulation.
The base is the thin, lightly doped central region where a small base current (IBI_B) directly controls a substantially larger collector current (ICI_C).
In current-controlled bipolar devices, variation in base current governs overall device conduction.

Key Concept

BJT Terminal Roles and Current Control Mechanism
Estimated Time:45s
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Topics

Transistors

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