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JAMB Physics 2012 Question 48

Question 48

Electronics

The p-n junction diodes can act as rectifiers because they

  1. A.conduct current when forward-biased
  2. B.conduct current when reverse-biased
  3. C.block current when forward-biased
  4. D.conduct current in both directions.
Show the answer and explanation

Answer: A (conduct current when forward-biased)

Explanation

A diode lets current through only when forward-biased and blocks it when reverse-biased, so it passes only one half of each a.c. cycle.