Definition of Kirchhoff's first law
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Kirchhoff's current law (1st Law) states that the sum of all currents entering into a node (or a junction) is equal to the sum of all currents leaving the node. This is a consequence of charge conservation.
Explanation:
- In figure, A is a node(or junction) formed by three conductors. The currents in these conductors are
- Some of these currents are flowing towards A and some other currents flowing away from it.
- According to Kirchhoff's Current Law,
(entering towards A) = (leaving from A)
- The current at node A is equal to zero.
- Mathematically, Kirchhoff’s Current law,
∑
- where n is the total number of branches carrying current towards or leaving from the junction.
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