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What are Kirchhoff’s laws? , What is Kirchhoff’s Laws?

Hello friends in this article we will know that kirchoff’s law What is (Kirchhoff’s Law)? And what is a treaty rule? And learn about many facts related to it.

Kirchhoff’s law Kirchhoff’s Law

Sometimes we come across circuits where simplification by series and parallel combination is impossible. As a result, Ohm’s law cannot be applied to solve such circuits. Kirchhoff has given two rules for solving such complex circuits:-


  • Kirchhoff’s Law of Current (KCL)
  • Kirchhoff’s Law of Voltage (KVL)

Kirchhoff’s law of current. Kirchhoff’s low (KCL)

This law relates to the currents at the junctions of an electric circuit and can be stated as follows: The algebraic sum is the zero of the currents meeting at a junction in an electric circuit. An algebraic sum is one in which the sign of the quantity is taken into account.

Kirchhoff’s Law

For example, streams I1I2I3 and I4 And consider four conductors. Meeting at point O, as shown in Fig. 2.9. If we take the signs of currents flowing towards point O as positive, then currents flowing through point O will be given negative signs. Thus, applying Kirchhoff’s law of current at junction O in Fig.

Sum of incoming currents = Sum of outgoing currents

(I1) + (I4) + (-I2) + (-I3) = 0 or I1 + I4 = I2 + I3

Therefore, Kirchhoff’s current law can also be stated as:


The sum of the currents flowing through any junction in an electric circuit is equal to the sum of the currents flowing through that junction. Kirchhoff’s law of clauses is rightly called the law of junction. Is.

Kirchhoff’s law of current is true because electric current is simply the flow of free electrons and they cannot accumulate at any point in the circuit. This is in accordance with the law of conservation. Therefore, Kirchhoff’s law of current is based on the law of conservation of charge.



Kirchhoff’s Voltage Law | Kirchhoff’s current low (KVL)

This law is related to emf and voltage drop in a closed circuit or loop and can be stated as follows:-

In any closed electrical circuit or trap, the algebraic sum of all electromotive forces (emf) and voltage drops across resistances is equal to zero.


i.e. algebraic sum of emf + algebraic sum of voltage drops in any closed circuit or mesh = 0


Kirchhoff’s Voltage Law | Kirchhoff’s voltage law

The validity of Kirchhoff’s Law) can be easily established with reference to the loop ABCDA shown in Fig. 2.10. If we start from a point (say point A) in this closed circuit and go back to this point (ie point A) after moving around the circuit, there is no increase or decrease in capacity.




Kirchhoff’s Law

This means that the algebraic sum of the emf of all sources (here only one emf source is considered) met in the way and the algebraic sum of the voltage drop across the resistors must be zero. Kirchhoff’s voltage law is based on “the law of conservation of energy, that is, the net change in energy of a charge after completing a closed path is zero.

pay attention :- Kirchhoff’s voltage Law is also called loop rule, sign convention. When applying Kirchhoff’s voltage law to a closed circuit, algebraic quantities are considered. Therefore, it is very important to give proper indication of emf and voltage drops in a closed circuit. The following signaling convention may be followed:



Kirchhoff’s Law

  • The increase in capacity should be considered as positive and the fall in capacity should be considered as negative. Thus, in Fig. 2.11, as we move from A to B (i.e., from the negative terminal of the cell to the positive terminal), the potential increases. In Fig. 2.11 (ii), the capacity also increases as we move from A to B.
  • In Fig. 2.12 (1), as we move from C to D, the potential drops. In Fig. 2.12 (ii), the potential drops again as we move from C to D.

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