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JAMB Physics 2004 Question 45

Question 45

Electrical Energy and Power

In the diagram above, the ratio of the electric power dissipated in the 6Ω and 3Ω resistors respectively is

Diagram for this question
  1. A.2:3.
  2. B.1:2.
  3. C.1:3.
  4. D.2:1.
Show the answer and explanation

Answer: B (1:2.)

Explanation

Both resistors have the full 12 V across them. P = V2/R gives 24 W and 48 W, a ratio of 1 : 2.