Module 2 : Transmission Lines
Lecture 2 : Transmission Lines in Practice
Distributed Circuit Elements
Due to transit time effect, the Kirchoff's laws cannot be applied to the circuit at a whole. However, if we take a small section of the line such that its length is , the transit time effect would be negligible and consequently the Kirchoff's laws can be applied.
 
A conductor carrying a current has magnetic field and consequently has flux linkage. The conductor therefore has inductance.
Similarly the two conductors form a capacitance.
Due to transit time effect the whole line inductance or capacitance cannot be assumed to be located at a particular point in space. The inductance and capacitance are distributed throughout the length of the line. These are therefore called the ' Distributed Parameters' of the line.