CBSE BOARD XII, asked by shadabalam200300, 2 months ago

Definition of Kirchhoff's first law​

Answers

Answered by presentmoment
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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 areI_{1} , I_{2} , I_{3}.
  • Some of these currents are flowing towards A and some other currents flowing away from it.
  • According to Kirchhoff's Current Law,

                         I_{1} + I_{2} = I_{3}

       (entering towards A) = (leaving from A)

  • The current at node A is equal to zero.
  • Mathematically, Kirchhoff’s Current law,

                ∑\left \ {{n} \atop {k=1}} \right. I_{k} =0

  • where n is the total number of branches carrying current towards or leaving from the junction.

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