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JAMB Physics 1984 Question 10

Question 10

Current Electricity

Two cells, each of e.m.f 1.5 V and an internal resistance 2 Ω are connected in parallel. Calculate the current flowing when the cells are connected to a 1 Ω resistor

  1. A.0.75 A
  2. B.1.5 A
  3. C.0.5 A
  4. D.1.0 A
  5. E.0.6 A
Show the answer and explanation

Answer: A (0.75 A)

Explanation

Identical cells in parallel give e.m.f. 1.5 V and internal resistance 2 × 2/(2 + 2) = 1 Ω. I = 1.5/(1 + 1) = 0.75 A.