WAEC Physics 2018 Objective — Question 42

Question 42 of 50 from the West African Examinations Council (WAEC) Physics 2018 Objective paper, with the correct answer and a full explanation.

A circuit contains three ammeters A₁, A₂ and A₃ with readings of A₂ and A₃ as indicated in the diagram above. Determine the reading of A₁

• A. 2A
• B. 3ACorrect
• C. 65A
• D. 8A

Explanation

Since current from the positive terminal splits and recombines, A₁ = A₃−A₂ = 5A−2A = 3A.

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