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JAMB Physics 1999 Question 42

Question 42

Electrical Energy and Power

In the diagram above, if the internal resistance of the cell is zero, the ratio of the powers P1 and P2 dissipated by R1 and R2 respectively, is

Diagram for this question
  1. A.R2/R1
  2. B.R1/R2
  3. C.(R1 + R2)/R1
  4. D.(R1 + R2)/R2
Show the answer and explanation

Answer: A (R2/R1)

Explanation

R1 and R2 are in parallel across the cell, so both have the same voltage V. P = V2/R, so P1/P2 = R2/R1.