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Question

An NPN transistor conducts when


A

both collector and emitter are positive with respect to the base.

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B

the collector is positive and the emitter is negative with respect to the base.

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C

the collector is positive and the emitter is at the same potential as the base.

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D

both collector and emitter are negative with respect to the base.

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Solution

The correct option is B

the collector is positive and the emitter is negative with respect to the base.


NPN Transistor Image 1
  1. The NPN transistor is made of semiconductor materials like silicon or germanium. When a p-type semiconductor material is fused between two n-type semiconductor materials, an NPN transistor is formed.
  2. An NPN transistor conducts when the collector is positive and the emitter is negative with respect to the base because the emitter-base junction is forward bias and the collector-base junction is reverse bias.

Hence, the answer is (B) the collector is positive and the emitter is negative with respect to the base.


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