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Difficulty: EasyTransistors

In electronics, bipolar junction transistors (BJTs) rely on three specialized terminals to control and route current. Match each BJT terminal to its primary functional role in a circuit.

  • BaseServes as the thin control layer that regulates overall carrier flow using a small input signal
  • EmitterIntroduces and supplies majority charge carriers into the semiconductor structure
  • CollectorGathers charge carriers that pass through the device to deliver current to the output circuit

Answer

Base matches with serving as the thin control layer that regulates carrier flow; Emitter matches with introducing and supplying majority charge carriers; Collector matches with gathering charge carriers to deliver output current.
Each terminal of a BJT has a designated task: the emitter supplies majority carriers, the base controls the rate of carrier flow via a small control signal, and the collector gathers these carriers to route current to the load circuit.

Step-by-Step Solution

1
Identify the primary role of the emitter terminal
The emitter is heavily doped to emit (inject) electrons or holes into the transistor body.
This establishes the supply of charge carriers needed for current flow.
2
Identify the primary role of the base terminal
The base controls the current flow through a small biasing voltage and current.
Because it is narrow and lightly doped, small variations at the base gate the bulk of current flowing across the device.
3
Identify the primary role of the collector terminal
The collector collects charge carriers swept across the base-collector junction.
It handles the bulk of power dissipation and passes the resulting amplified or switched current to the load.

Key Concept

Bipolar Junction Transistor (BJT) terminal roles and charge carrier dynamics
Estimated Time:45s
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Topics

Transistors

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