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According to Kirchhoff's Current Law, what must be true at any junction in an electric circuit?
AThe algebraic sum of currents at the junction is zero
BThe algebraic sum of voltages at the junction is zero
CThe current through each branch is always equal
DThe power delivered at the junction is zero
Answer & Solution
Correct answer: A. The algebraic sum of currents at the junction is zero
Kirchhoff's Current Law states that charge is conserved at a node, so total current entering equals total current leaving. Equivalently, the algebraic sum of currents at the junction is zero.