## Electric Machine Losses and Efficiency with Examples

Manish Kumar Saini

Updated on 02-Jul-2021 09:18:53

There are two types of electric machines viz. static electric machines (e.g. transformer) and rotating electric machines (e.g. motors and generators). All electric machines are not ideal, therefore they have some losses due to which efficiency being less than 100%. In general, we come across three popular electric machines viz. transformer, ... Read More

## Electric Generator: Construction and Working Principle

Manish Kumar Saini

Updated on 02-Jul-2021 09:13:16

The electric generator is an electromechanical energy conversion device, which converts mechanical energy into electrical energy.Construction of Electric GeneratorAn electric generator has following main parts −Magnetic Field SystemArmature CoreArmature WindingYokeMagnetic Field SystemThe magnetic field system is used to produce uniform magnetic field in the electric generator within which the armature ... Read More

## Capacitors in DC Circuits

Manish Kumar Saini

Updated on 02-Jul-2021 09:10:58

Capacitor & CapacitanceWhen any two conducting surfaces are separated by an insulating material, it called as a capacitor. The conducting surfaces are known as plates of the capacitor and the insulating material is known as dielectric.The ability of a capacitor to store charge is termed as capacitance of the capacitor. ... Read More

## Capacitor Types: Fixed & Variable Capacitors

Manish Kumar Saini

Updated on 02-Jul-2021 08:57:11

Capacitors can be classified depending upon their fixed or variable capacitance as follows −Fixed CapacitorsThose capacitors whose value of capacitance is fixed during the manufacturing and cannot be changed later are known as fixed capacitors. The symbol of the fixed capacitor is shown in figure.The fixed capacitors are classified into ... Read More

## Basics of Three-Phase Electricity

Manish Kumar Saini

Updated on 02-Jul-2021 08:45:42

The phase-electricity is produced by a 3-phase generator that has three separate but identical windings, which are called phases. The 3-phase windings of the 3-phase generator are displaced 120° apart from each other and rotate in a common uniform magnetic field. Therefore, a three-phase generator produces three voltages of the ... Read More

## Ammeter: Definition & Working Principle

Manish Kumar Saini

Updated on 02-Jul-2021 08:41:35

An ammeter is a measuring instrument which is used for the measurement of electric current in an electric circuit.An ammeter has a low resistance. The ammeter is connected in series with the load to measure the electric current flowing through it. As, the ammeter has a very low resistance, therefore ... Read More

## Alternative Ways of Generating Electricity

Manish Kumar Saini

Updated on 02-Jul-2021 08:33:34

Apart from the conventional methods of generating electricity (like thermal, hydroelectric, gas turbine, nuclear power etc.), there are also some alternative methods of generating electricity, which are as follows −Solar PowerThe electricity can be generated from the heat of the sun. In the solar power system, the energy of sunlight ... Read More

Manish Kumar Saini

Updated on 02-Jul-2021 08:27:57

Electrical power is generated, transmitted and distributed in the form of 3-phase power because it has the following advantages over the single phase system −The three phase power has a constant magnitude while the power in single phase system is the function of supply frequency i.e. pulsates from zero to ... Read More

## Absolute and Relative Magnetic Permeability (µ)

Manish Kumar Saini

Updated on 02-Jul-2021 08:24:44

Absolute Magnetic PermeabilityThe absolute (or actual) magnetic permeability of a material is its conductivity for the magnetic flux. It is denoted by a Greek letter μ ‘(mu)’ and measured in Henry per meters (H/m). Thus, Absolute permeability of material, $$\mu=\mu_{0}\mu_{r}\:H/m$$Where, μ0 = absolute permeability of air or vacuum.μr = relative permeability ... Read More

## What is Nodal Analysis?

Manish Kumar Saini

Updated on 24-Jun-2021 12:54:45

Nodal Analysis is a method for determining the branch currents in a circuit. In this method, one of the nodes is taken as the reference node. The potentials of all the nodes in the circuit are measured with respect to this reference node.The nodal analysis is based on the Kirchhoff’s ... Read More