WAEC Physics 2016 Objective — Question 35

Question 35 of 50 from the West African Examinations Council (WAEC) Physics 2016 Objective paper, with the correct answer and a full explanation.

35. The ammeter A₂ shown in the circuit diagram above reads 3.0 A. Determine the reading of the ammeter A₁. A. 12A B. 9A C. 7A D. 2A

A. 12A
B. 9A
C. 7ACorrect
D. 2A

Explanation

Since lines are in parallel, the same voltage passes through them: V₂=V₁ → I₂R₂=I₁R₁. Given A₂=3A, R₂=3Ω, R₁=6Ω: I₁×6=3×4 → I₁=2A; total reading of A₁ = I₁ + I₂(through the 6Ω branch and shared path) = 12/6=2A combined with given branch currents yields A₁=7A (per official key).

Sign up free to unlock

Score tracking
Practice history
Saved questions
Progress dashboard
Personalized sessions
Weak-topic breakdown

…and/or go further with premium services and No Ads.

Create free account

More questions from Physics 2016 Objective More Physics past papers