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Explain Working principle of electrodynamometer type of instrument with diagram and working?
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Explain Working principle of electrodynamometer type of instrument?
The working principle of a basic electrodynamometer instrument is same as the PMMC instrument. The only difference in this case is that the permanent magnet is replaced with two fixed coils connected in series. The moving coil is also connected in series with the fixed coils. The two fixed coils are connected to electromagnets in such a manner that they form poles of opposite polarity. As the moving coil carries current through it and is being placed in the field of fixed coils, it experience a force due to which the moving coil rotates. The direction of this force is independent of the supply voltage as the current flowing through fixed coils and moving coil is one and the same. If the direction of current changes in the moving coil, then the field direction also changes, thus making the torque unidirectional.
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working principle of electrodynamometer is - when the same current passes through two concetric coils placed at right angles to each other,the resulting torque depends on the square of the current. Electrodynamometer is used to construct various instruments like voltmeters,ammeters & also for constructing AC/DC wattmeters for any waveform of current & voltage.it is also used for frequency measurements & hormonic analysis.
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The working principle of these instruments is same as that of the d'Arsonval type of galvanometers, the difference being that a direct reading instrument is provided with a pointer and a scale. The basic principle of this device is the interaction of magnetic field of the compass (a permanent magnet) and the field around the conductor (a simple electromagnet)
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