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Question

Difficulty: MediumTransistors

In a bipolar junction transistor (BJT) used in a common-emitter circuit, which terminal receives the small control current required to regulate the larger current flowing between the other two terminals?

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

Answer

The base terminal receives the small control current that regulates current flow between the collector and emitter.
In a bipolar junction transistor (BJT), the base is the central control terminal. A small current entering the base allows a significantly larger current to conduct between the collector and emitter, functioning as an amplifier or an electronic switch.

Step-by-Step Solution

1
Identify the terminal architecture of a bipolar junction transistor (BJT)
A standard BJT has three functional leads: the Base, the Collector, and the Emitter.
Establishes the available terminal functions specific to current-driven bipolar transistors.
2
Determine the control mechanism in a common-emitter configuration
Applying a small base current (IBI_B) modulates a larger collector current (ICI_C) according to the transistor gain (β\beta), yielding IC=β×IBI_C = \beta \times I_B.
Identifies the base as the designated input control lead in BJT switching and amplification circuits.

Key Concept

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

Transistors

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