Introduction of AmmeterAs we know a word “meter” is associated with the measurement system. Meter is an instrument which can measure a particular quantity. As we know, the unit of current is Ampere. Ammeter means Ampere-meter which measures ampere value. Ampere is the unit of current so an ammeter is a meter or an instrument which measures current.Working Principle of AmmeterThe main principle of ammeter is that it must have a very low resistance and also inductive reactance. Now, why do we need

We have three phase system and by convention we write three phases as RYB. Phase sequence indicator is the indicator that determines the phase sequence of the three phase supply system.When we give conventional three phase supply (i.e. RYB) to the induction motor, we see that the direction of the rotation of the rotor is in clockwise direction.Now what will happen to direction of rotation of rotor if the phase sequence is reversed, the answer to this question is that the rotor will rotate in the

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 obtained from wattmeter, ammeter and voltmeter. Obviously there various limitations of using this method as it may not provide high accuracy, also chances of increment of error is very high. Therefore th

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 measurement of frequency on the meter”. Construction of weston frequency is as compared to ferrodynamic type of frequency meter. In order to construct a circuit diagram we need two coils, three induct

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 sufficient. Measurement of reactive power is essential because if the reactive power is more in the circuit then the electrical power factor will be poor hence losses will be more. On the basis of power supply, t

Anelectronic DC voltmeteris 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 semiconductor components such as diodes, transistors, and amplifiers to increase their sensitivity and accuracy.What is a DC Voltage?A DC voltage is a constant voltage that does not change its polarity or magnitude

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 flow meter is, how it works, what are its types, applications, and benefits.What is an Air Flow Meter?An air flow meter is defined as a device that measures the rate of air flow in a duct or pipe. The

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 attraction depends upon the strength said magnetic field. If the magnet is electromagnet then the magnetic field strength can easily be increased or decreased by increasing or decreasing current through it

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. Although a multimeter works quite well if we need a rough value of resistance, but for accurate values and that too at very low and very high values we need specific methods. In this article we will discuss

History of MeggerThe 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 use and quite safe.What is Megger?Insulation resistance IR quality of an electrical system degrades with time, environment condition, i.e., temperature, humidity, moisture and dust particles. It also g