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JAMB Physics 1994 Question 44

Question 44

Electrical Energy and Power

Two resistors, R1 = 4Ω and R2 = 5Ω, are connected in parallel across a potential difference. If P1 and P2 represent the power dissipated in R1 and R2 respectively, then the ratio P1 : P2 is

  1. A.4 : 5
  2. B.5 : 4
  3. C.16 : 25
  4. D.25 : 16
Show the answer and explanation

Answer: B (5 : 4)

Explanation

In parallel both have the same voltage, so P = V2/R and P1 : P2 = 1/4 : 1/5 = 5 : 4.