Electrical Engineering › Section D · Parallel and series-parallel circuits › Topic D.2
Kirchhoff's current law
Whatever current flows into a junction must flow out again. Kirchhoff's current law turns that bookkeeping into equations that find unknown currents anywhere in a network, even inside a sealed chip you cannot see into.
In this topic
- Current in equals current out
- Nodes, regions and signs
- Worked example: one unknown at a node
- Assumed directions
- KCL explains series and parallel
- Worked example: a network of three nodes
- KCL on a closed boundary
- How many equations?
- Common mistakes to avoid
- Key takeaways
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