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JAMB Physics 2011 Question 37

Question 37

Current Electricity

Three similar cells each of e.m.f 2 V and internal resistance 2Ω are connected in parallel, the total e.m.f and total internal resistance are respectively

  1. A.2 V, 6.0Ω
  2. B.6 V, 0.7Ω
  3. C.6 V, 6.0Ω
  4. D.2 V, 0.7Ω.
Show the answer and explanation

Answer: D (2 V, 0.7Ω.)

Explanation

Identical cells in parallel give the e.m.f. of one cell, 2 V, and an internal resistance of 2 ÷ 3 ≈ 0.7 Ω.