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Electric Circuit Analysis by K. S. Suresh Kumar

IntroductIon
Energy storage elements 

inductance and capacitance 

lend memory to the electrical circuits and 
make interesting dynamic behaviour in them possible. The simplest of such dynamic circuits will 
contain one such energy storage element along with passive resistors and linear dependent sources. 
Further simplification is possible by ruling out dependent sources and limiting the resistors to one. We 
consider one such two-element circuit containing one energy storage element in detail in this chapter. 
Chapter 
10


10.2
First-Order 
RL
Circuits
Specifically, we study series and parallel RL circuits with voltage source and current source excitations 
of different waveshape with and without initial energy storage.
These circuits are simple in structure. However, that does not imply that their dynamic behaviour 
is trivial. The simple nature of these circuits does not imply that they are unimportant. In fact, simple 
RL and RC circuits find applications in almost all areas of Electrical and Electronics Engineering. 
Moreover, they display almost all the important features of dynamics displayed by the general class 
of ‘Linear Time-Invariant (LTI) Circuits’. They form very simple and effective circuit examples to 
convey important concepts in the analysis of LTI circuits. 
Circuits containing a large number of inductors, capacitors and dependent sources will require 
simulation tools for quantitative analysis. However, a thorough understanding of the behaviour of 
simple circuits like the ones covered in this chapter will help the engineer develop qualitative insight 
into such circuits and arrive at approximate quantitative results. No complex and costly circuit 
simulation package is a satisfactory substitute for this kind of analytic capability in an engineer.
We use simple RL circuits to bring out many basic concepts in linear dynamic circuits in this chapter. 

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