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JAMB Physics 2006 Question 1

Question 1

Electronics

When the base current of a common-emitter transistor is kept at zero, it operates in the

  1. A.active-on region.
  2. B.breakdown region.
  3. C.saturation region.
  4. D.cut-off region.
Show the answer and explanation

Answer: D (cut-off region.)

Explanation

A transistor conducts only when a base current flows. With the base current at zero the collector current is (almost) zero, so the transistor is in the cut-off region (switched off).