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JAMB Physics 1999 Question 45

Question 45

Electronics

A semi-conductor diode is used in rectifying alternating current into direct current mainly because it

  1. A.allows current to flow in either direction
  2. B.is non-linear
  3. C.offers a high input resistance
  4. D.allows current to flow only in one direction.
Show the answer and explanation

Answer: D (allows current to flow only in one direction.)

Explanation

A diode conducts in one direction only, so it blocks the reverse half of each a.c. cycle.