CBSE Class 12-science Answered

Kirchoff's current law

 The total current entering a junction or a node is equal to the toal current  leaving the node .

 In above figure some currents are entering junction-A and some currents are leaving junction-A.

 Total current entering junction-A = I₁ + I₃ + I₅

 Total current leaving junction-A = I₂ + I₄ 

 By Kirchoff's current rule ,   I₁ + I₃ + I₅ = I2 + I4 

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Kirchoff's voltage law

The voltage around a loop equals the sum of every voltage drop in the same loop for any closed network and equals zero.

In the above closed loop circuit ABCD , let us find the sum of voltages by going through clockwise starting from A . We get

By Kirchoff's voltage law , 

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