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JAMB Physics 1999 Question 29

Question 29

Current Electricity

Four cells each of e.m.f. 1.5 V and internal resistance of 4 Ω are connected in parallel. What is the effective e.m.f. and internal resistance of the combination?

  1. A.6.0 V, 16 Ω
  2. B.6.0 V, 1 Ω
  3. C.1.5 V, 4 Ω
  4. D.1.5 V, 1 Ω.
Show the answer and explanation

Answer: D (1.5 V, 1 Ω.)

Explanation

Identical cells in parallel keep the e.m.f. of one cell (1.5 V), and their internal resistances combine as 4/4 = 1 Ω.