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In a BJT, what is the role of the base terminal?

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Question: In a BJT, what is the role of the base terminal?

Options:

  1. To collect charge carriers
  2. To control the current flow
  3. To provide power
  4. To dissipate heat

Correct Answer: To control the current flow

Solution: 

The base terminal of a BJT controls the current flow between the collector and emitter by allowing a small input current to control a larger output current.

In a BJT, what is the role of the base terminal?

Practice Questions

Q1
In a BJT, what is the role of the base terminal?
  1. To collect charge carriers
  2. To control the current flow
  3. To provide power
  4. To dissipate heat

Questions & Step-by-Step Solutions

In a BJT, what is the role of the base terminal?
  • Step 1: Understand that a BJT (Bipolar Junction Transistor) has three terminals: collector, emitter, and base.
  • Step 2: Know that the base terminal is the middle part of the BJT.
  • Step 3: Realize that the base terminal needs a small amount of current to operate.
  • Step 4: Learn that this small current at the base controls a larger current that flows from the collector to the emitter.
  • Step 5: Conclude that the base terminal acts like a switch, allowing the small input current to control the larger output current.
  • Current Control – The base terminal regulates the flow of current between the collector and emitter in a BJT.
  • Input vs Output Current – A small input current at the base controls a larger output current between collector and emitter.
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