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Which of the following diagrams represents correctly an n-p-n transistor?

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Which of the following diagrams represents correctly an n-p-n transistor?

Which of the following diagrams represents correctly an n-p-n transistor?

QUICK ANSWER…

C

EXPLANATION…

n-p-n transistor will have:

n-type emitter,

p-type base at the center, and

n-type collector.

And because the direction of current is usually from positive to negative (p to n), the direction of the emitter arrow will be from p-type base outward to the n-type emitter. So, option C is correct.

Now for the right answer to the above question:

  1. Option A is incorrect. the arrow showing direction of current should be from positive to negative, that is p-type base to n-type emitter and not the opposite.
  2. Option B is incorrect. the arrow is usually on the emitter and not the collector.
  3. C is correct. the direction of the arrow is correctly from the p-type base to the n-type emitter.
  4. D is not the correct answer. The arrow should be on the emitter and not the collector.

HELPFUL TIPS…

You may please note these/this:

  • The arrow is usually on the emitter and not on the collector.
  • The direction of the arrow is usually from p-type material to n-type material, this means the arrow on npn transistor will be outward while that on pnp transistor will be inward.

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/ culled from 2018 JAMB-UTME physics question 32 /

Which of the following diagrams represents correctly an n-p-n transistor? » QuizTablet
Which of the following diagrams represents correctly an n-p-n transistor? » QuizTablet

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