The scale of an electrodynamometer usually reads the:a)Average value of the acb)Mean value of the acc)Effective value of the acd)Squared value of the acCorrect answer is option 'C'. Can you explain this answer? - EduRev Electrical Engineering (EE) Question

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The scale of an electrodynamometer usually reads the:

a)
Average value of the ac
b)
Mean value of the ac
c)
Effective value of the ac
d)
Squared value of the ac

Correct answer is option 'C'. Can you explain this answer?

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Most Upvoted Answer

The scale of an electrodynamometer usually reads the:a)Average value o...

Electrodynamometer instrument:

Electrodynamic type instruments are similar to the PMMC-type elements except that the magnet is replaced by two serially connected fixed coils that produce the magnetic field when energized.
The fixed coils are spaced far enough apart to allow passage of the shaft of the movable coil.
The movable coil carries a pointer, which is balanced by counterweights. Its rotation is controlled by springs.
The motor torque is proportional to the product of the currents in the moving and fixed coils. If the current is reversed, the field polarity and the polarity of the moving coil reverse at the same time, and the turning force continues in the original direction.

Measurement using Electrodynamometer instrument:

This type of instrument can be used to measure AC or DC current, voltage, or its major application as a wattmeter for power measurement.
For voltage and current measurement, the moving and fixed are serially connected. For power measurement, one of the coils (usually the fixed coils) passes the load current and other coil passes a current proportional to the load voltage.
Similar to moving iron vane instruments, the electrodynamic instruments are true RMS (effective value) responding meters.
When electro dynamic instruments used for power measurement its scale is linear because it predicts the average power delivered to the load and it is calibrated in average values for AC.

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