What is Electrodynamometer type instrument?

What is Electrodynamometer type instrument?

An electrodynamometer or simply Dynamometer wattmeter is an instrument that is universally used for the measurement of DC as well as AC electric power. It works on the principle of dynamometer i.e. a mechanical force acts between two current carrying conductors.

What is the function of Electrodynamometer?

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. It uses for measuring the power of both the AC and DC circuits.

What is Electrodynamometer how it is used as an ammeter and voltmeter?

An electrodynamometer type instrument is a moving coil instrument in which the operating field is produced by another coil which is fixed. This type of instrument can be used either as an ammeter or as a voltmeter, but is generally used as a wattmeter. ELECTRODYNAMIC INSTRUMENT AS AN AMMETER.

Why Electrodynamometer instrument is also named transfer instrument?

These instruments have the same accuracy for both dc and ac. Explanation: Precision type electrodynamometer (EMMC) is used in the standardization process of the potentiometer and hence It is a transfer instrument.

Why sensitivity of Electrodynamometer type instrument is low?

These instruments have a low torque/weight ratio and hence the low sensitivity. Low torque/weight ratio gives increased frictional losses. These errors must be minimized, if high accuracy is desired.

What are the advantages of Electrodynamometer?

What are the advantages of electrodynamometer?

  • As the instrument coils are air cared, so these instruments are free from hysteresis and eddy current errors.
  • These instruments can be used on both a.c. and d.c. and since they have a precision grade accuracy, they are very useful as transfer instruments.

How Electrodynamometer can be used for power measurement?

The Electrodynamometer wattmeter has two coils i.e., fixed and moving coils. The fixed coil is connected in series with the circuit in order to measure power consumption. The supply voltage is applied to the moving coil.

Why Electrodynamometer type of instrument can be used for both AC and DC?

Electrodynamometer-type instruments are very useful for accurate measurement of RMS values of voltages irrespective of waveforms. Because of precision grade accuracy and the same calibration for ac and dc measurements, these instruments are useful as transfer type and calibration instruments.

What is Electrodynamometer ammeter?

The electrodynamometer is a transfer-type instrument. A transfer-type instrument is one that may be calibrated with a dc source and then used without modification to measure AC. This requires the transfer type instruments to have the same accuracy for both DC and AC.

What is the limitations of Electrodynamometer type wattmeter?

(i) They have a low torque/weight ratio and hence have a low sensitivity. (ii) Low torque/weight ratio gives increased frictional losses. (iii) They are more expensive than either the PMMC or the moving iron type instruments.

Which of the following torque is essential in indicating instruments?

In order to ensure proper operation of indicating instruments, the following three torques are required: Deflecting torque. Controlling torque. Damping torque.

Which of the following is the main principle of Electrodynamometer type ammeter?

Electro-dynamic Effect
Detailed Solution. Electrodynamometer type instrument utilized the principle of Electro-dynamic Effect or force between two current-carrying coils.