kirchof law

Kirchhoff has given two rules based on conservation of electric charge and of energy, these are known as Kirchhoff’s laws

Kirchhoff’s First Law or Junction Rule The algebraic sum of electric currents at any junction of electric circuit is equal to zero i.e. the sum of current entering into a junction is equal to the sum of current leaving the junction i.e.

Junction law supports law of conservation of charge because this is a point in a circuit which cannot act as a source or sink of charge(s).
Kirchhoff’s Second Law or Voltage Rule In any closed mesh of electrical circuit, the algebraic sum of emf’s of cell and the product of currents and resistance is always equal to zero i.e.

Kirchhoff’s second law supports the law of conservation of energy. Because the net change in the energy of a charge, after the charge complete a closed path must be zero