Discussion
Kirchhoff's voltage law state that :
Answer: C
Kirchhoff's voltage law states that the algebraic sum of voltage drops and emf in a closed loop is zero.
Going round any closed loop of a circuit and returning to the starting point, the potential must come back to its original value. So the emfs met on the way, taken with their signs, are exactly balanced by the IR drops: the algebraic sum of all emfs and drops round the loop is zero, which can also be written as the sum of emfs equalling the sum of drops.
The first option omits the closed loop and the signs, and the sum of emfs alone is zero only in a loop with no current. A total drop being 'finite' says nothing about how voltages are related.
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