Chart of the wattmeter relationship. Figure 48. Utility companies use a wattmeter to determine how much to... Our experts can answer your tough homework and study questions. It is costlier than an induction instrument of the same ratings. This device is available in a purely electronic form too which is known as digital wattmeter. Definition: The instrument whose working depends on the reaction between the magnetic field of moving and fixed coils is known as the Electrodynamo-meter Wattmeter. 5. Utility companies use a wattmeter to determine how much to... See full answer below. The traditional form of wattmeter is called as dynamometer wattmeter. © copyright 2003-2020 Study.com. c. Alternative Current Power Measurement Phase Back Example: The basic unit of power is watt. (adsbygoogle = window.adsbygoogle || []).push({}); But in AC circuit, this simple technique will not be applicable as we need to consider the power factor too ( ie, P = VIcosΦ). for one phase power measurement Alternative current power measurements can be made using the Wattmeter gauge. In this post we are going to understand how wattmeter works... before that just refresh about the electrical power. Wattmeter - Introduction: Wattmeter is an instrument used to measure the electrical power. The current coil of each wattmeter carries the current of one phase only and the pressure coil measures the phase voltage of the phase. At zero power factor, corresponding to a purely reactive load, both wattmeters will again have the same wattage indication but with the opposite signs, so that their algebraic sum will yield zero power absorbed, as it should. Below is shown a picture of the wattmeter link for DC power measurement. In the picture above it can be seen that in connecting to the load and power supply line of wattmeter power for one phase power measurement there is similarity with DC power measurement of output input terminal at Wattmeter have in common with when measuring DC power. (adsbygoogle = window.adsbygoogle || []).push({}); Below is shown a picture of the wattmeter link for DC power measurement. As shown in the above figure, the wattmeter has two sets of coils. One coil is fixed and is made in two identical parts. Power = Voltage x Current Direct Current Power Measurement At low power factors the inductance of pressure coil introduces serious error. In measuring the load of 1 phase switch current (I) at position number 5 next switchtegangan (V) at position 100 then C = 5 (according to table above), then if needle shows number 30 then power reading formulated as follows: The function of a wattmeter is to measure the amount of electricity that you are using. April 19, 2020 Wattmeter is an instrument of electrical power meter which is a combination of voltmeter and ampermeter. In this instrument there are two kinds of coils that is the current coil and the voltage coil. The voltage coil is mounted on a circular manner. So it has low resistance. The standing wave ratio meter, SWR meter, ISWR meter (current " I " SWR), or VSWR meter (voltage SWR) measures the standing wave ratio (SWR) in a transmission line. The couples multiplied by the two coils are directly proportional to the multiplication of current and voltage. It could sound like a slogan, but the wattmeter is actually a very useful tool used by electricians and anyone in the electricity business to measure the amount of electricity being used. In measuring the load of 1 phase switch current (I) at position number 5 next switchtegangan (V) at position 100 then C = 5 (according to table above), then if needle shows number 30 then power reading formulated as follows: Below is shown a picture of the wattmeter link for one phase power measurement. Types of wattmeters. Restoring torque is provided by contrawound spiral springs, as in the moving coil meter. Watt definition: So it has relatively high resistance. 5 Below is shown a picture of a wattmeter link for one phase power measurement. Calculations need to be done as listed in the table provided above. Both voltage and current coils will produce magnetic fields. The traditional form of wattmeter is called as dynamometer wattmeter. Wattmeter Construction & Working Principle: The dynamometer wattmeter works on the motor principle. This requires more turns in moving coil and hence increased power loss. All rights reserved. Services, Working Scholars® Bringing Tuition-Free College to the Community. Construction of a Wattmeter Wattmeter is an instrument used to measure the electrical power. P = UIC Advantages of dynamometer wattmeter: How to connect the wattmeter to the circuit? November 29, 2014. P = V.I The other coil which is known as voltage coil,  is wound from fine gauge wire. Below is shown a picture of a wattmeter link for one phase power measurement. These fields interact to each other and produce a deflecting torque on the voltage coil. 1,268 Views, a. Electricity is created through electro-magnetic conversion seen with wires, chemical reactions seen with batteries, and solid-state conversions seen with solar cells. Earn Transferable Credit & Get your Degree. It is placed between the two parts of the current coil. Chart of the wattmeter relationship. Electricity carries and delivers energy through an electric current of flowing electrons. In this instrument there are two kinds of coils that is the current coil and the voltage coil. All other trademarks and copyrights are the property of their respective owners. P = 750 watts, Below is shown a picture of the wattmeter link for one phase power measurement. It uses for measuring the power of both the AC and DC circuits. Watt is denoted by a letter W and is measured by an instrument called as wattmeter. For d.c. circuits, strictly speaking  wattmeter is not necessary. The sum of the wattmeter readings gives the total power absorbed by the load. Power Definition: Figure 50. At the measurement of electric power one-phase alternating current load is performed by using 4 terminal point I / O at Wattmeter ie terminal Iin, Iout, L1 and L2. In the picture above it can be seen that in connecting to the load and power supply line of wattmeter power for one phase power measurement there is similarity with DC power measurement of output input terminal at Wattmeter have in common with when measuring DC power. Direct current power measurements can be made using the Wattmeter gauge. This device is available in a purely electronic form too which is known as digital wattmeter. Please subscribe to get updates to your mail id... Powered by  - Designed with the Hueman theme. The power consumed in a circuit is 1 watt if a potential difference of one volt causes 1 ampere of current to flow through the circuit. Sciences, Culinary Arts and Personal for one phase power measurement Alternative current power measurements can be made using the Wattmeter gauge. Become a Study.com member to unlock this Create your account. So a compensation is mandatory. The interacting fields are proportional to the circuit voltage(V) and current(I)  respectively. Simply by multiplying V and I the power can then be calculated. The meter indirectly measures the degree of mismatch between a transmission line and its load (usually an antenna). How to connect the wattmeter to the circuit? Discuss how a wattmeter is connected into a... ILTS Science - Physics (116): Test Practice and Study Guide, Michigan Merit Exam - Science: Test Prep & Practice, UExcel Earth Science: Study Guide & Test Prep, Prentice Hall Biology: Online Textbook Help, Prentice Hall Chemistry: Online Textbook Help, Holt McDougal Modern Biology: Online Textbook Help, TExES Physics/Mathematics 7-12 (243): Practice & Study Guide, High School Chemistry Syllabus Resource & Lesson Plans, High School Chemistry: Homework Help Resource, High School Biology Curriculum Resource & Lesson Plans, Prentice Hall Physical Science: Online Textbook Help, Biological and Biomedical Direct current power measurements can be made using the Wattmeter gauge. We know that the units of power are watts, so as for many other instruments, we can easily know that where the name of this instrument comes from. Figure 49. (adsbygoogle = window.adsbygoogle || []).push({}); In this post we are going to understand how wattmeter works... before that just refresh about the electrical power. The wattmeter linkage for DC power measurement. b. Wattmeter is an instrument of electrical power meter which is a combination of voltmeter and ampermeter. Figure 50. Figure 49. The total power in the load is given by the algebraic sum of the readings … Posted by: Taufiqullah The couples multiplied by the two coils are directly proportional to the multiplication of current and voltage. The voltage coil may be connected either on the supply side or the load side of the current coil. ie, VI which is nothing but circuit power. Alternative Current Power Measurement Types of Ammeters, Voltmeters Electrical Instruments. The wattmeter linkage for three phase power measurements.