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JAMB Physics 1995 Question 39

Question 39

Current Electricity

If a resistance is halved in value and the potential difference across it is tripled, then the ratio of the new current to the old is

  1. A.1 : 6
  2. B.1 : 3
  3. C.2 : 1
  4. D.6 : 1
Show the answer and explanation

Answer: D (6 : 1)

Explanation

I = V/R. The new current is (3V)/(R/2) = 6V/R, six times the old, so the ratio is 6 : 1.