Electrical Engineering Guides

Power Systems

Power Factor Meters | Electrodynamometer Type Power Factor Meter

Before we introduce various types of power factor meters it is very essential to understand what are the needs of power factor meter? Why we do not directly calculate power factor in an AC circuit just by dividing the power with product of current and voltage because these readings can be easily obt

By Electrical4u 03/27, 2024
Power Systems

Weston Type Frequency Meter

The main principle of working of weston type frequency meter is that “when an current flows through the two coils which are perpendicular to each other, due to these currents some magnetic fields will produce and thus the magnetic needle will deflects towards the stronger magnetic field showing the

By Electrical4u 03/27, 2024
Power Systems

Varmeter | Single Phase and Polyphase Varmeter

The instruments which measure the reactive power of the circuit are called varmeter . What is reactive power? The reactive power in the circuit is given by VIsinA . Here there is no need to give an explanation about the physical meaning of reactive power, as only a mathematical relation is sufficien

By Electrical4u 03/27, 2024
Power Systems

Electronic DC Voltmeter: Definition, Types and Applications

An electronic DC voltmeter is a device that measures the direct current (DC) voltage across any two points of an electric circuit . It is an essential tool for testing, troubleshooting, and designing electronic circuits and devices. Unlike mechanical voltmeters, electronic voltmeters use semiconduct

By Electrical4u 03/27, 2024
Power Systems

Air Flow Meter: Definition, Types, Applications and Benefits

An air flow meter is a device that measures the rate, pressure, and direction of airflow in a duct or pipe. Air flow meters are used for various purposes, such as monitoring ventilation, optimizing combustion, controlling emissions, and ensuring safety. In this article, we will explain what an air f

By Electrical4u 03/27, 2024
Power Systems

Moving Iron Instrument

This instrument is one of the most primitive forms of measuring and relay instrument. Moving iron type instruments are of mainly two types. Attraction type and repulsion type instrument. Whenever a piece of iron is placed nearer to a magnet it would be attracted by the magnet. The force of this attr

By Electrical4u 03/27, 2024
Power Systems

Measurement of Resistance

Resistance is one of the most basic elements encountered in electrical and electronics engineering. The value of resistance in engineering varies from very small value like, resistance of a transformer winding, to very high values like, insulation resistance of that same transformer winding. Althoug

By Electrical4u 03/27, 2024
Power Systems

Megger | Working Principle Types History Uses of Megger

History of Megger The device is being used since 1889, popularity raised during 1920s since the long back device is same in its uses and purpose of testing, few real improvements appeared in recent years with its design and quality of tester. Now high-quality options are available which are easy to

By Electrical4u 03/27, 2024
Power Systems

Rectifier Type Instrument | Construction Principle of Operation

Rectifier type instrument measures the alternating voltage and current with the help of rectifying elements and permanent magnet moving coil type of instruments. However the primary function of rectifier type of instruments work as voltmeter. Now one question must arises in our mind why we use recti

By Electrical4u 03/27, 2024
Power Systems

Electrostatic Type Instruments Construction Principle Torque Equation

Working Principle of Electrostatic Type Instruments As the name suggests the electrostatic type instrument use static electrical field to produce the deflecting torque. These types of instrument are generally used for the measurement of high voltages but in some cases they can be used in measuring t

By Electrical4u 03/27, 2024
Power Systems

Permanent Magnet Moving Coil (PMMC) Meter

What is a Permanent Magnet Moving Coil (PMMC)? A Permanent Magnet Moving Coil ( PMMC ) meter – also known as a D’Arsonval meter or galvanometer – is an instrument that allows you to measure the current through a coil by observing the coil’s angular deflection in a uniform magnetic field . A PMMC met

By Electrical4u 03/27, 2024
Power Systems

Errors in Measurement | Classification of Errors

In order to understand the concept of errors in measurement , we should know the two terms that defines the error and these two terms are written below: True Value It is not possible to determine the true value of a quantity by experiment means. True value may be defined as the average value of an i

By Electrical4u 03/27, 2024

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

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Power Factor Meters | Electrodynamometer Type Power Factor Meter

Weston Type Frequency Meter

Varmeter | Single Phase and Polyphase Varmeter

Electronic DC Voltmeter: Definition, Types and Applications

Air Flow Meter: Definition, Types, Applications and Benefits

Moving Iron Instrument

Measurement of Resistance

Megger | Working Principle Types History Uses of Megger

Rectifier Type Instrument | Construction Principle of Operation

Electrostatic Type Instruments Construction Principle Torque Equation

Permanent Magnet Moving Coil (PMMC) Meter

Errors in Measurement | Classification of Errors

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