WAEC Physics 2013 Paper

Concept:Cells connected in parallel give the same equivalent e.m.f as one cell, and the circuit current is found using Ohm’s law.Explanation:From the circuit diagram, the two cells are connected in parallel.So the equivalent e.m.f is the same as that of one cell: $E = 2\,V$.The total resistance in the circuit is $R = 2\,\Omega$.Neglecting internal resistance, apply Ohm’s law:$$I = \frac{E}{R} = \frac{2}{2} = 1.0\,A.$$Answer:The equivalent e.m.f is $2\,V$ and the current flowing through the circuit is $1.0\,A$.Therefore, the correct option is A.