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JAMB Physics 1983 Question 19

Question 19

Current Electricity

The diagrams in Fig. 3 show three circuits. The internal resistances of the batteries are negligible. Which of the currents is the largest?

Diagram for this question
  1. A.I1
  2. B.I2
  3. C.I3
  4. D.I4
  5. E.I5.
Show the answer and explanation

Answer: E (I5.)

Explanation

I1 = 10/2 = 5 A, I2 = 10/1 = 10 A, I3 = 20/3 ≈ 6.7 A (series), I4 = 20/2 = 10 A and I5 = 20/1 = 20 A. I5 is largest.