In a transistor amplifier, the composition of the current in any branch during operation is:

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  1. the sum of AC and DC
  2. DC only
  3. AC only
  4. the multiplication of AC and DC

Answer (Detailed Solution Below)

Option 1 : the sum of AC and DC
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Concept

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In a transistor amplifier, each branch (base, collector, emitter) carries a current composed of:

Total Current DC bias current AC signal current

  • The DC component is required to bias the transistor and set its operating point (Q-point).
  • The AC component represents the input signal that gets amplified.


This combined current ensures linear amplification without distortion, provided the transistor remains in its active region.

So, during normal amplifier operation, the current is a sum of AC and DC components, not one or the other alone.

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