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

What is a Potentiometer?Apotentiometer(also known as apotorpotmeter) is defined as a 3 terminalvariable resistorin which theresistanceis manually varied to control the flow ofelectric current. A potentiometer acts as an adjustablevoltage divider.How Does a Potentiometer Work?A potentiometer is a passive electronic component. Potentiometers work by varying the position of a sliding contact across a uniform resistance. In a potentiometer, the entire input voltage is applied across the whole length

Various methods are used for measurement of three phase power in three phase circuits on the basis of number of wattmeters used. We have three methods to discuss: Three wattmeters method Two wattmeters method Single wattmeter method.Let us discuss one by one each method in detail.Measurement of Three Phase Power by Three Wattmeters MethodThe circuit diagram is shown below-Here, it is applied to three phase four wire systems, current coil of all the three wattmeters marked as 1, 2 and 3 are conne

Before we study the internal construction of electrodynamometer type wattmeter, it is essential to know the working principle of electrodynamometer type wattmeter. Dynamometer type wattmeter works on very simple principle and this principle can be stated as when any current carrying conductor is placed inside a magnetic field, it experiences a mechanical force and due to this mechanical force deflection of conductor takes place.Construction and Working Principle of Electrodynamometer Type Wattme

What is a Low Power Factor Wattmeter?A low power factor meter is an instrument that is used to accurately measure low values of power factor. Before we study more about the low power factor meter, we need to understand why we need a low power factor wattmeter in the first place (as opposed to a standard electrodynamometer wattmeter)The answer is simple: a standard wattmeter gives inaccurate results.Now there are two main situations where we should not use an ordinary wattmeter in measuring a low

Digital frequency meter is a general purpose instrument that displays the frequency of a periodic electrical signal to an accuracy of three decimal places. It counts the number events occurring within the oscillations during a given interval of time. As the preset period gets completed, the value in the counter display on the screen and the counter reset to zero. Various types of instruments are available which operates at a fixed or variable frequency. But if we operate any frequency meter at d

Digital Multimeter is a device which has two words in its name: Digital and Multimeter. Let’s first try to analyze why do we have them there i.e. what do each of them actually convey which in turn helps us understand what does a multimeter do. The first word – digital – indicates that the meter has a digital or liquid crystal display while the next word – multimeter – indicates that this single device can be used for multipurpose i.e. to measure more than one parameter. A typical digital multime

A digital multimeter (DMM) is a versatile and essential tool for measuring electrical quantities such as voltage, current, resistance, capacitance, frequency, temperature, and more. It can also test the continuity and diode function of circuits and components. A digital multimeter can display the measured values on a digital screen, making it easy to read and record. In this article, we will explain what a digital multimeter is, how it works, what features it has, and how to use it safely and ef

Multimeters as the name suggest the meters that we use to measure multiple quantities with the same instrument. The most basic multimeter measures voltage, current, and resistance. Since we use it for measuring current (A), voltage (V) and resistance (Ohm), we call it as AVO meter. We can categorise the multimeters into two groups, namely analog multimeter and digital multimeter. We will discuss here in this article about analog multimeter.Analog multimeter was first of its type, but due to late

What is a Flow Meter?A flow meter is a piece of equipment used to measure the flow rate of solids, liquids, or gases. Flow meters can do this linearly, non-linearly, volumetrically, or on a weight basis. Flow meters are also known as flow gauges, flow indicators, or liquid meters.Types of Flow MetersThe main types of flow meters include: Mechanical Flow Meters Optical Flow Meters Open Channel Flow MetersMechanical Flow MetersPositive Displacement Flow MetersThese meters measure the flow rate by

A capacitance meter is a piece of electronic test equipment whose purpose is to measure capacitance, mostly of discrete capacitors. The capacitance meter works based off of the directly proportional relationship between capacitance and a time constant.This relation is used in this method of measurement. So, we can first go through a simple RC circuit with a supply voltage of VIN (shown below).During the charging period of the capacitor, the voltage across the capacitor at any instant isThe time