WAEC Physics 2022 Objective — Question 23
Question 23 of 50 from the West African Examinations Council (WAEC) Physics 2022 Objective paper, with the correct answer and a full explanation.
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Three cells each of emf, 1.1V, and internal resistance, 2Ω, are connected in parallel across a 3 resistor. Determine the current in the resistor.
- A. 0.90 A
- B. 0.39 A
- C. 0.30 ACorrect
- D. 0.01 A
Explanation
For 3 identical cells in parallel: EMF=1.1V, internal resistance = 2/3Ω. Current I = E/(R+r) = 1.1/(3+2/3) = 1.1/3.667 = 0.30A.
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