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JAMB Physics 1979 Question 15

Question 15

Current Electricity

The sum of the currents I1 and I2 in Fig. 4 is

Diagram for this question
  1. A.1.2 A
  2. B.0.6 A
  3. C.0.8 A
  4. D.2 A
  5. E.1 A
Show the answer and explanation

Answer: D (2 A)

Explanation

Each branch has the full 12 V across it. I2 = 12/10 = 1.2 A and I1 = 12/(5 + 10) = 0.8 A, so the sum is 2 A.