Lead Acid Battery There are two types current namely ac and dc. We know that, DC current can be stored. The electrical energy in dc nature store in the form of chemical energy. The device that stores electrical energy in chemical energy is called “electric cell“. Electric cell has small storage capacity. So cells are connected […]

# Fundamental of electrical engineering

# Superposition Theorem

Superposition Theorem This theorem is useful for those circuits that contain two or more than two sources. This theorem is applicable only when network or circuit contains with linear elements. The sources of emf connected only in parallel not in series. According to this theorem the current flowing through any section is the algebraic sum […]

# Graph Theory

Graph Theory When all the elements in a circuit or network are replaced by lines with dots, such configuration is called graph of the network. The all elements such as capacitor, inductor or resistor must satisfy Kirchhoff’s laws. Based on these laws, we can form a number of equations in graph theory. Terminology Used in […]

# Electrical Earthing

Electrical Earthing Earthing means connecting of the non current carrying parts of electrical device or equipment or the neutral point of the power system to the earth through a wire or conducting materials having very low resistance. An electrical earthing is very necessary for equipment and power system. It protects the electrical equipment and power […]

# Capacitance

Capacitance Capacitance is ability of a capacitor to electric charge. A capacitor stores electric energy in the form of electric field. The capacitance of a capacitor is defined as. It is the ration of amount of charge required per unit potential difference. The Unit of capacitance is farad and it is denoted by capital letter […]

# Inductance

Inductance Inductance is the property of a coil by virtue which it opposes any change of magnitude and direction of current, when flowing through the coil. When an electric current passed through a coil, an electromagnetic field is formed around the coil. A change in magnitude of an electric current, it changes the electromagnetic field. […]

# Norton’s Theorem

Norton’s Theorem Thevenin’s Theorem is used to simplify a network to a constant voltage source with a resistance in series but Norton Theorem can be used to resolve a complex network into a constant. Current source with a resistance in parallel. Norton’s Theorem is converse of Thevenin Theorem. The Norton Theorem can be stated as […]

# Magnetic Circuit

Magnetic Circuit The closed path followed by the magnetic flux is known as Magnetic Circuit. A magnetic flux follows a complete closed circuit coming back to its starting point. A circuit consists of a material having a high permeability usually iron sot steel is used for making magnetic circuit. High permeability material offers small opposition […]

# Voltage, Potential Difference and EMF

Voltage, Potential Difference and EMF According to the structure of an atom, we know that there are two types of charges namely positive charge and negative charge. A force of attraction exists between these two charges because of the opposite polarity of these charges (positive charge and negative charge). A certain amount of energy is […]

# Thevenin’s Theorem

Thevenin’s Theorem Thevenin’s theorem was formulated for resistive networks by French physicist M. Leon. Thevenin, who proposed it in 1883. It may be enunciated as follows Any two terminal networks consisting of linear impedance and emf sources may be replaced by a single voltage source with a equivalent series resistance. It makes the solution of […]