Suppose you move once completely around a closed loop in a circuit and return to the starting point. The net change in electric potential must be zero because
AThe current becomes zero after one round
BPotential is a single-valued state function at a point
CEvery resistor supplies energy
DCharges are destroyed and recreated in the loop
Answer & Solution
Correct answer: B. Potential is a single-valued state function at a point
When you return to the same point in a circuit, the electric potential at that point must be the same as before; potential is single-valued. Therefore the algebraic sum of potential rises and drops around the loop is zero, which is KVL.
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