Introduction For analysing the linear electric circuits that consists of two or more independent sources (Voltage or current or both), superposition theorem is extremely used (particularly for time domain circuits with elements operated at different frequencies). If a linear DC circuit has more than one independent source, we can find the current (through a resistance) […]

## Norton’s Theorem

Introduction In contrast to the Thevenin’s theorem, Norton’s theorem replaces the part of the circuit with an equivalent circuit that constitute a current source and a parallel resistance. This theorem is an extension of the Thevenin’s theorem, proposed by E. L. Norton in 1926. Similar to the Thevenin’s theorem, it is also used to calculate […]

## Thevenins Theorem

Introduction For many linear circuits, analysis is greatly simplified by the use of two circuit reduction techniques or theorems as Thevenin’s and Norton’s theorems. The thevenin’s theorem is named after a French engineer, M. L. Thevenin’s in 1883 and Norton’s theorem after a scientist E. L. Norton. By using these theorems a large or complex […]

## Nodal Analysis

Introduction The main concept behind the nodal analysis is that , in a given circuit if the node voltages are known, then we can immediately determine all branch currents associated with the circuit. As we know that , for finding node voltages we use KCL. In this technique, node voltages are considered as variables in […]

## Star Delta Transformations

As we have seen in previous articles, for simplifying the circuits we used series and parallel combination of resistors to reduce the circuit complexity. In addition, to these we often use source transformation methods to analyse the circuit. But these techniques are not applicable for all types of networks. Many circuits consist of three terminal networks […]

## Mesh analysis

In circuit analysis, simple circuits can be analysed by using the basic analysing tools like ohms law, KVL and KCL. But for a complex circuit that consists of various controlled sources, these tools in addition with series and parallel methods are unreliable. Therefore, to find the variables of a branch in such circuit, nodal and […]

## Source Transformation

Source transformation methods are used for circuit simplification to modify the complex circuits by transforming independent current sources into independent voltage sources and vice-versa. To analyse the circuits we can apply a simple voltage and current divider techniques by using these transformations. This source transformation method can also be used to convert a circuit from […]

## Kirchhoff’s Laws

Introduction Many of the electrical circuits are complex in nature and the computations required to find the unknown quantities in such circuits, using simple ohm’s law and series/parallel combination simplifying methods is not possible. Therefore, in order to simplify these circuits Kirchhoff’s laws are used. These laws are the fundamental analytical tools that are used […]

## Ohm’s Law and Electric Power

For analyzing DC circuits , generally we use different methods such as ohm’s law, network theorems and other circuit simplification tools. A DC circuit analysis is performed mainly to determine the unknown quantities such as voltage, current, resistance and power which are allied with one or more elements of an electronic circuit. As a basic […]

## DC Motor

Introduction Almost every mechanical movement that we see today is accomplished by an electric motor. An electric motor takes electrical energy and produces mechanical energy. Electric motors come in various ratings and sizes. Some applications of large electric motors include elevators, rolling mills and electric trains. Some applications of small electric motors are robots, automobiles […]