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JAMB Physics 1997 Question 40

Question 40

Current Electricity

Three electric cells each of e.m.f. 1.5 V and internal resistance 1.0 Ω are connected in parallel across an external resistance of 2/3 Ω. Calculate the value of the current in the resistor.

  1. A.0.5 A
  2. B.0.9 A
  3. C.1.5 A
  4. D.4.5 A
Show the answer and explanation

Answer: C (1.5 A)

Explanation

Identical cells in parallel give e.m.f. 1.5 V and internal resistance 1/3 Ω. I = 1.5 ÷ (2/3 + 1/3) = 1.5 A.