JAMB Physics 2007 Objective — Question 17
Question 17 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2007 Objective paper, with the correct answer and a full explanation.
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Use the diagram below (three cells each of e.m.f. 1.5V and internal resistance 2.5 ohm connected in parallel) to answer this question. Find the net e.m.f. and the internal resistance.
- A. 4.5V, 7.50 ohm
- B. 4.5V, 0.83 ohm
- C. 1.5V, 7.50 ohm
- D. 1.5V, 0.83 ohmCorrect
Explanation
The cells are connected in parallel, so the net emf equals a single cell's emf (1.5V). Combined internal resistance: 1/r = 1/2.5+1/2.5+1/2.5 = 3/2.5, giving r = 0.83 ohm.
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