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what are kirchhoff's law?explain them.

Kirchhoff’s First Law − Junction Rule

  • The algebraic sum of the currents meeting at a point in an electrical circuit is always zero.

I1, I2 I3, and I4

Convention:

Current towards the junction − positive

Current away from the junction − negative

I3 + (− I1) + (− I2) + (− I4) = 0
 

Kirchhoff’s Second Law − Loop Rule

  • In a closed loop, the algebraic sum of the emfs is equal to the algebraic sum of the products of the resistances and current flowing through them.

For closed part BACB,

E1 − E2 = I1R1 + I2 R2 − I3R3

For closed part CADC,

E2 = I3R3 + I4R4 + I5R5

 

 

 
 

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View Full Answer

kirchoff 'rules are vry useful for analysis of eletric circuits,

a) junction rule: at any junction,the sum of the currents entering the junction is equal to the sum of currents leaving the junction.

b)Loop rule:the alny algebriac sum of charges in potential around any closed loop involving resistors and cells in the loop is zero.

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Kirchhoff's Law Can Be Explained By The These TwoRules

  1. Kirchhoff's Voltage Law
  2. Kirchhoff's Loop Rule

1. Kirchhoff's Voltage Law States That The Algebraic Sum Of The Voltages Across Any Set Of Branches In A Closed Loop Is Zero. Kirchhoff's Voltage Law Is A Result Of The Electrostatic Field Being Conservative. Generally, We Can Say That The Law Defines How Current Is Distributed In An Electronic Circuit.

2.Kirchhoff's Loop Rule Is The Principle Of Conservation Of Energy Which Implies That The Directed Sum Of The Electrical Voltage Around Any Closed Network Is Zero, Or More Simply, The Sum Of The Emfs In Any Closed Loop Is The Same As The Sum Of The Potential Drops In That Loop. This Principle Which Is Widely Used In Electrical Engineering Was First Described In 1845 By Gustav Kirchhoff; A German Physicist Of The 18th Century.

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