Notify me when new comments are added. Pressure coil is connected across the circuit whose power is to be measured and current coil is connected in series. Thus circuit voltage is impressed across the PC and CC carries the circuit current. Working Principle. Let the rms voltage of circuit is V and current flowing is I. For this we connect the wattmeter to the circuit as shown in figure below.

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Notify me when new comments are added. Pressure coil is connected across the circuit whose power is to be measured and current coil is connected in series. Thus circuit voltage is impressed across the PC and CC carries the circuit current. Working Principle. Let the rms voltage of circuit is V and current flowing is I. For this we connect the wattmeter to the circuit as shown in figure below. As a high value of series resistance is connected in series with the PC, therefore PC circuit can be assumed purely resistive.

Therefore the current flowing through the PC is in phase with the circuit voltage V and given as. But we know that,. Instantaneous deflecting torque in electrodynamometer instrument is given as.

In case of electrodynamometer wattmeter, i 1 is current through PC and i 2 is current through CC. Therefore deflecting torque. The above expression gives the instantaneous deflecting torque of electrodynamometer wattmeter.

But the instrument will respond to the average deflecting torque over a time period. Therefore we need to calculate the average of deflecting torque T d. Average deflecting torque. Controlling torque is provided by spring. Therefore controlling torque Tc is given as.

At balanced condition,. Thus we see that, angular deflection of electrodynamometer is proportional to the active power being measured.

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## Working Principle of Electrodynamometer Wattmeter

Electrodynamometer Wattmeter are often used for the measurement of power consumption. The construction of such instrument similar to the construction of electrodynamometer type ammeter and voltmeter. An electrodynamometer wattmeter have two types of coils. One coil is fixed and another coil is moving.

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## Electrodynamometer Type Wattmeter

An electrical instrument used to measure electric power in watts of any circuit is called Wattmeter. It consists of two coils like the current coil and voltage coil. Wattmeters are mainly used in electrical circuit measurement, debugging, transmission, distribution of electrical power, power rating, consumption of electrical appliances, utility frequency measurement, home appliances and many more. These are classified into three types. They are Electrodynamometer wattmeter, Induction type wattmeter, Electrostatic type wattmeter. Let us discuss an overview of the Electrodynamometer wattmeter.

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## Electrodynamometer Type Wattmeter Working Principle & Construction

Facebook Twitter. These instruments are similar in design and construction to electrodynamometer type ammeters and voltmeters. The two coils are connected in different circuits for measurement of power. The fixed coils or "field coils" are connected in series with the load and so carry the current in the circuit.

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## Electrodynamometer Wattmeter – Construction

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 a moving coil that is free to rotate is kept under the influence of a current carrying conductor, then automatically a mechanical force will be applied to the moving coil, and this force will make a little deflection of the moving coil. If a pointer is connected with the moving coil, which will move of a scale, then the deflection can be easily measured by connecting the moving coil with that pointer. This type of watt meter consists of two types of coil, more specifically current coil and voltage coil.