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JAMB Physics 1985 Question 44

Question 44

Electrical Energy and Power

In Fig. 4, current (I) passes through the parallel combination. If the power dissipated in the 5 Ω resistor is 40 W, then the power dissipated in the 10 Ω resistor is

Diagram for this question
  1. A.10 W
  2. B.20 W
  3. C.40 W
  4. D.80 W
  5. E.100 W
Show the answer and explanation

Answer: B (20 W)

Explanation

The resistors are in parallel, so they have the same voltage and P = V²/R. Doubling R halves the power: 40/2 = 20 W.