Introduction Nowadays, many electromechanical or electrical equipments from household appliances, such as uninterrupted power supplies to industrial power and motor control equipments , consist of power electronic circuits, in which thyristors play an important role as solid-state switching devices. The conventional methods of power control involve use of variable tap-changing transformers, shunt and series regulators […]

## Signed Binary Numbers

Introduction In general, we represent the positive (unsigned) numbers without any sign indication and negative numbers with ‘minus’ (negative sign) sign before them. But these are not applicable for computing in the digital systems like, computers , as the data is represented in binary number system. So to represent the sign a special notation is […]

## Maximum Power Transfer Theorem

Introduction In any electric circuit, the electrical energy from the supply is delivered to the load where it is converted into a useful work. Practically, the entire supplied power will not present at load due to the heating effect and other constraints in the network. Therefore, there exist a certain difference between drawing and delivering […]

## Superposition Theorem

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 […]

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