What is Kirchhoff's first law, Kirchhoff's point rule, Kirchhoff's junction rule (or nodal rule), and Kirchhoff's first rule?

Asked by Topperlearning User | 27th Apr, 2015, 02:22: PM

Expert Answer:

Kirchhoff’s first law
Kirchhoff's current rule states that the algebraic sum of the currents meeting at a junction in a closed circuit is zero.
 
Kirchhoff’s junction rule or point rule.
The current entering the junction is equal to the current leaving that junction.
 
 
Consider a junction O in an electrical circuit at which 5 conductors meets.
If I1, I2 , I3 , I4 , I5 be the currents flowing through them then according to the Kirchhoff's Law,
 
(-I1) + (-I2) +  I3 + (-I4) +  I5 = 0
 
-I1 + -I2 +  I3 -  I4 +  I5 = 0
 

Answered by  | 27th Apr, 2015, 04:22: PM