# Mathematical Modelling of Electrical Systems

In this post we will discuss on mathematical modelling of electrical systems which is very essential for further study of control systems. In my early post I discuss on **What is an automatic control systems?** And **Classification of Control Systems**, you may read those.

The system may be considered to be consisting of an inter connection of smaller components or elements, whose behaviour can be described by means of mathematical equations or relationships.

Most of the electrical systems can be modelled by three basic elements: Resistor, inductor, and capacitor. Circuits consisting of these three elements are analysed by using Kirchhoff’s Voltage law and Current law.

* Resistor: In bellow *the circuit model of resistor is shown in Fig.

The mathematical model is given by the Ohm’s law relationship,

* Inductor: In bellow *the the circuit representation is shown in Fig

The input output relations are given by Faraday’s law,

If only a single coil is considered, the inductance is known as self-inductance. If a voltage is induced in a as second coil due to a current in the first coil, the voltage is said to be due to mutual inductance, as shown in Fig

* Capacitor: In bellow *the circuit symbol of a capacitor is given in Fig.

If we integration of v(t) is known as the charge on the capacitor and is denoted by *‘q’. *Thus

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In above discussion we can see the Mathematical Modelling of Electrical Systems which has come to act when we go for Laplace transform. It will come to act when we will go for calculate transient response of an electrical systems in time domain.

Hope this above discussion on Mathematical Modelling of Electrical Systems will be helpful to you.

Please follow our website for further discussion on various topic related control systems. In future we will discussion on

1 Time Response Analysis of Control Systems

2 Stability of Systems

3 Root Locus Analysis

4 Frequency Response of Control Systems

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