Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

This theorem has been introduced in the year of 1952 by Dutch Electrical Engineer Bernard D.H. Tellegen. This is a very useful theorem in network analysis. According to Tellegen theorem, the summation of instantaneous powers for the n number of branches in an electrical network is zero. Are you confused? Let’s explain. Suppose n number of branches in an electrical network have i1, i2, i3, …………. in respective instantaneous currents through them. These currents satisfy Kirchhoff’s Current Law.Agai

Maximum Power Transfer TheoremSuppose we have a voltage source or battery that’s internal resistance is Ri and a load resistance RL is connected across this battery. Maximum power transfer theorem determines the value of resistance RL for which, the maximum power will be transferred from source to it. Actually the maximum power, drawn from the source, depends upon the value of the load resistance. There may be some confusion let us clear it.Power delivered to the load resistance,To find the maxi

Concept of Compensation TheoremThis theorem is based on one basic concept. According to Ohm’s law, when current flows through any resistor, there would be a voltage drop across the resistor. This dropped voltage opposes the source voltage. Hence voltage drop across a resistance in any network can be assumed as a voltage source acting opposite to the source voltage. The compensation theorem depends upon this concept.Explanation of Compensation TheoremAccording to this theorem, any resistance in a

What is Reciprocal Property?In many electrical networks it is found that if the positions of voltage source and ammeter are interchanged, the reading of ammeter remains the same. It is not clear to you. Let’s explain it in details. Suppose a voltage source is connected to a passive network and an ammeter is connected to other part of the network to indicate the response.Now any one interchanges the positions of ammeter and voltage source that means he or she connects the voltage source at the pa

If there are several sources acting simultaneously in an electrical circuit, then the current through any branch of the circuit is summation of currents which would flow through the branch for each source keeping all other sources dead.Let us understand the statement.Here, two 1.5 Volt batteries present in the circuit. At this condition, the current through 1 ohm resistance is 1.2 ampere.The ammeter indicates this value in the above picture.Now, we replace the left side battery by a short circui

There are some simple relationships between currents and voltages of different branches of an electrical circuit. These relationships are determined by some basic laws that are known as Kirchhoff laws or more specifically Kirchhoff Current and Voltage laws. These laws are very helpful in determining the equivalent electrical resistance or impedance (in case of AC) of a complex network and the currents flowing in the various branches of the network. These laws are first derived by Guatov Robert K

As name implies, the main concept of this theorem which is based upon substitution of one element by another equivalent element. Substitution theorem gives us some special insights in circuit behavior. This theorem is also used to prove several other theorems.Statement of Substitution TheoremSubstitution theorem states that if an element in a network is replaced by a voltage source whose voltage at any instant of time is equals to the voltage across the element in the previous network then the i

Millman’s theorem was named after famous electrical engineering professor JACOB MILLMAN who proposed the idea of this theorem. Millman’s theorem acts as a very strong tool in case of simplifying the special type of complex electrical circuit. This theorem is nothing but a combination of Thevenin’s Theorem and Norton’s Theorem. It is very useful theorem to find out voltage across the load and current through the load.This theorem is also called as PARALLEL GENERATOR THEOREM.Millman’s theorem is a

What is Thevenin’s Theorem (Thevenin Equivalent)?Thevenin theorem (also known as the Helmholtz–Thévenin theorem) states that any linear circuit containing only voltage sources, current sources, and resistances can be replaced by an equivalent combination of a voltage source (VTh) in series with a single resistance (RTh) connected across the load. This simplified circuit is known as the Thevenin Equivalent Circuit.Thevenin’s theorem was invented by a French engineer Léon Charles Thévenin (hence t

What is Norton Theorem? (Norton’s Equivalent Circuit)Norton’s Theorem (also known as the Mayer–Norton theorem) states that it is possible to simplify any linear circuit to an equivalent circuit with a single current source and equivalent parallel resistance connected to a load. The simplified circuit is known as the Norton Equivalent Circuit.More formally, Norton’s theorem can be stated as: “A circuit having any linear bilateral elements and active sources can be replaced by a simple two-termina