WAEC Physics 2025 Theory — Question 33
Question 33 of 34 from the West African Examinations Council (WAEC) Physics 2025 Theory paper, with the correct answer and a full explanation.
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2(b)(i) A battery has an e.m.f. of 12.0 V and an internal resistance of 0.5 Ω. If a 2 Ω resistor is connected across the battery terminals, calculate the terminal voltage.
Model answer
log RT = 0.17 → RT = 10^0.17 ≈ 1.48 Ω. (xi) Precautions taken: ensured tight connections of the wire, key and other component parts; avoided error due to parallax when taking readings on ammeter and voltmeter respectively.
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