Question

State Kirchhoff's rules. Explain briefly how these rules are justified.

Answer 1

Kirchoff's law related to solve for unknown current in multiple -loop or non simple -loop .

there are two law ,

Kirchoff's 1st law :- this law is also known as junction rule or current law ,
according to this law, the algebric sum of current meeting at a junction is zero .
e.g sigma I =0
this law represent conservation of charge .it means at any junction, the sum of the current entering the junction must be equal to the sum of the current leaving the junction .

Kirchoff's 2nd law :- according to this law , algebric sum of the voltage around any closed loop is zero .

e.g sigma V =0

this law represent the law of conservation of energy.

Answer 2

Kirchoff's rules is generally used to solve complicated circuits those circuits which cannot be solved by easy approach.

Kirchoff's states two basics rules which are:-----

1) junction rule

=) Before knowing this rule first know that what is junction ..
junction is the point where two or more than two wire meets that point is called junction.

so Kirchoff's 1st law states that all incoming current to the junction is equal to outgoing current away from the junction.

OR

this rule is based on conservation of charge

summation of all incoming and outgoing current is equal to zero

I.e £ I = 0

second rule......

2) loop rule..

loop is the closed path in the circuits ...

2nd law states that : potential drop throughout the circuits is equal to rise in potential.

OR

sum of drop in potential and rise in potential is equal to zero.

I.e. £ ∆V = 0

this rule is based on energy conservation.