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If the algebraic sum of voltages around a closed loop is not zero, which conclusion follows under Kirchhoff's Voltage Law?
AThe loop equation has been written with an incorrect sign, missing element, or wrong value.
BKirchhoff's Current Law must also be false for every junction in the circuit.
CThe circuit contains no source.
DThe current in the loop must be zero.
Answer & Solution
Correct answer: A. The loop equation has been written with an incorrect sign, missing element, or wrong value.
For an ideal lumped circuit, KVL requires the algebraic sum around any closed loop to be zero. If it is not, the usual cause is an error in sign convention, omitted voltage, or incorrect component value. It does not automatically imply KCL is false or that current is zero.