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In analyzing a circuit, when should Kirchhoff's Current Law be applied instead of Kirchhoff's Voltage Law?
AWhen balancing currents at a junction or node
BWhen adding voltage changes around a closed path
CWhen finding resistance from $V=IR$ only
DOnly in circuits with a single battery
Answer & Solution
Correct answer: A. When balancing currents at a junction or node
KCL is the node law: it is used at junctions to relate currents entering and leaving. KVL, by contrast, is used around closed loops to relate voltage rises and drops.