WAEC Physics 2025 Objective — Question 18

Question 18 of 51 from the West African Examinations Council (WAEC) Physics 2025 Objective paper, with the correct answer and a full explanation.

Use the circuit diagram below to answer this question. The current passing through the 6Ω resistor is 1.5A. Calculate the current in the 3Ω resistor.

A. 1.20A
B. 0.90A
C. 0.75A
D. 0.60ACorrect

Explanation

The 2Ω and 3Ω resistors are in parallel and share the total current of 1.5A. By the current-divider rule: I(3Ω) = R(2Ω)/(R(2Ω)+R(3Ω)) × I = 2/5 × 1.5 = 0.6A.

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