WAEC Physics 2013 Objective — Question 36
Question 36 of 50 from the West African Examinations Council (WAEC) Physics 2013 Objective paper, with the correct answer and a full explanation.
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An electric circuit is connected as illustrated above (three 2V cells in parallel, connected to a 2Ω resistor). Determine the equivalent Emf and current flowing through the circuit respectively, neglecting the internal resistance of the cells.
- A. 2V, 1.0ACorrect
- B. 2V, 4.0A
- C. 6V, 0.3A
- D. 6V, 3.0A
Explanation
Since the three cells are connected in parallel, the equivalent emf equals that of one cell: E = 2V (the potential difference/emf across any number of cells connected in parallel is the same as that across each of them). Current I = V/R = 2/2 = 1.0A.
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