# Circuit Theory

## Polyphase System

Polyphase System is a combination of two or more than two voltages having same magnitude and frequency but displaced from each other by an equal electrical angle. As poly means, many (more than one) and phase means windings or circuits. Each of them has a single alternating voltage of the same magnitude and frequency. The …

## Parallel Resonance

Parallel Resonance means when the circuit current is in phase with the applied voltage of an AC circuit containing an inductor and a capacitor connected together in parallel. Let us understand the Parallel Resonance with the help of a circuit diagram shown below: Consider an Inductor of L Henry having some resistance of R ohms …

Admittance method is used for solving parallel AC circuits. The admittance shows the reliability of the electrical circuit to allow the electric current to pass through it. First of all, we must know the meanings of some terms used in the Admittance Method. Admittance The reciprocal of the impedance of an AC circuit is known …

## Phasor Method for Solving Parallel Circuits

For solving Parallel Circuits, a number of branches are connected in parallel. Each branch contains a number of components like resistance, inductance and capacitance forming a series circuit. Each branch of the circuit is analysed separately as a series circuit and after that, the effects of each branch are combined together. For circuit calculations, the …

## Independent Dependent Voltage and Current Source

The source which supplies the active power to the network is known as the electrical source. The electrical source is of two types namely independent source and dependent source. The Independent and Dependent source means, whether the voltage or current sources are either depending upon some other source, or they are acting independently. Energy Sources …

## Voltage Source and Current Source

A Source is a device which converts mechanical, chemical, thermal or some other form of energy into electrical energy. In other words, the source is an active network element meant for generating electrical energy. The various types of sources available in the electrical network are voltage source and current sources. A voltage source has a …

## Nodal Voltage Analysis Method

The Nodal Voltage Analysis is a method to solve the electrical network. It is used where it is essential to compute all branch currents.The nodal voltage analysis method determines the voltage and current by using the nodes of the circuit. A node is a terminal or connection of more than two elements. The nodal voltage …

## Mesh Current Analysis Method

Mesh Current Analysis Method is used to analyze and solve the electrical network having various sources or the circuit consisting of several meshes or loop with a voltage or current sources. It is also known as the Loop Current Method. In the Mesh Current method, a distinct current is assumed in the loop and the …

## Substitution Theorem

Substitution Theorem states that the voltage across any branch or the current through that branch of a network being known, the branch can be replaced by the combination of various elements that will make the same voltage and current through that branch. In other words, the Substitution Theorem says that for branch equivalence, the terminal voltage …

## Maximum Power Transfer Theorem

Maximum Power Transfer Theorem states that – A resistive load, being connected to a DC network, receives maximum power when the load resistance is equal to the internal resistance known as (Thevenin’s equivalent resistance) of the source network as seen from the load terminals. The Maximum Power Transfer theorem is used to find the load …