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What does Kirchhoff's Current Law express physically?
AEnergy is conserved around a closed loop
BCharge is conserved at a junction
CResistance is the same in all branches
DVoltage is directly proportional to current in every element
Answer & Solution
Correct answer: B. Charge is conserved at a junction
Kirchhoff's Current Law comes from conservation of charge. Charge cannot accumulate indefinitely at an ideal junction, so current entering must equal current leaving.