### ELECTRODYNAMOMETER WATTMETER PDFELECTRODYNAMOMETER WATTMETER PDF

Electrodynamometer Wattmeter consists of two coils, pressure coil (PC) and current coil (CC). Pressure coil is connected across the circuit. ELECTRODYNAMOMETER. WATTMETER’S. • These instruments are similar in design and construction to electrodynamometer type ammeters and voltmeters. Before we study the internal construction of electrodynamometer wattmeter, it very essential to know the principle of working of electrodynamometer type. Author: Tygojora Kazirr Country: Peru Language: English (Spanish) Genre: Technology Published (Last): 19 November 2016 Pages: 21 PDF File Size: 11.90 Mb ePub File Size: 17.89 Mb ISBN: 321-1-11130-951-2 Downloads: 63142 Price: Free* [*Free Regsitration Required] Uploader: Vogis  Posted wattmfter November 14, November 14, Author Mr. The wattmeter is an instrument for measuring the electric power or the supply rate of electrical energy in watts of any given circuit. If the pressure coil has range of volts, the half of it can be used so that the range becomes volts. Now the reason is very obvious of using two fixed coils instead of one, so that it can be wlectrodynamometer to carry considerable amount of electric current.

Posted on June 1, July 24, Author Mr. They can be used for both to measure AC as well as DC quantities as scale is calibrated for both. Following are the advantages of electrodynamometer type wattmeters and they are written as follows: If the pressure coil is purely resistive, then their current wattmete in phase with the voltage. This mechanical force deflects the pointer which is mounted on the calibrated scale. The current coils are arranged such a way, that they are connected with the circuit in series. These coils are called the electric current coils of electrodynamometer type wattmeter.

The instantaneous torque acts on the pointer of the wattmeter and is given by the equation. Now the reason is very obvious of using two fixed coils instead of one, so that it can be constructed to carry considerable amount of electric current. The wire is either stranded or eleftrodynamometer to avoid eddy current loss. Following are the advantages of electrodynamometer type wattmeters and they are written electrodynamomfter follows:.

HELIOTROPIUM INDICUM PDF

As simple as other voltmeter and ammeter connection. The Electrodynamometer Wattmeter has electrodynamoeter types of coils; fixed and the moving coil. Fixed coil is chosen as a current coil as it can be made more massive.

Wikimedia Commons has media related to Wattmeters. 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 fieldit experiences a mechanical force and due to electrodynamo,eter mechanical force deflection of conductor takes place.

The real power divided by the apparent volt-amperes VA is the power factor. Electrodynamometer Type Wattmeter in general, a watt meter is used to measure the electric power of a circuit, or sometime it also measures the rate of energy transferred from one circuit to another circuit.

When current flows through the current coils, then automatically a magnetic field is developed around those coils. Let watmeter rms voltage of circuit is V and current flowing is I. Errors due to stray magnetic field. Simple meters may be calibrated to meet specified accuracy only for sinusoidal waveforms.

## Electrodynamometer Type Wattmeter

So the expression for the torque can be written as: For this we connect the wattmeter to the circuit as shown in figure below. Hence the instantaneous value of torque can be written as Average value of deflecting torque can be obtained by integrating the instantaneous torque from limit 0 to T, where T is the time period of the cycle.