Wheatstone Bridge: AC Source Effects on Balancing Condition

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Using an AC source in a Wheatstone bridge does not modify the balancing condition, but it affects the detection method. A galvanometer, typically used for DC measurements, will not indicate movement under AC conditions. Instead, an AC meter is required, although it may lack the sensitivity of a galvanometer. Hot wire galvanometers can be used for AC measurements if available. Specialized AC bridge instruments are designed to provide effective values based on selected frequency and impedance characteristics.
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Homework Statement



Will the balancing condition get modified in Wheatstone bridge if AC source is used instead of a battery ?


Homework Equations





The Attempt at a Solution

 
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No, but if you use a galvanometer (as is usual) as a detector, it wouldn't move.
You would need an AC meter, which probably woudn't be as sensitive as a galvanometer.
 
clem said:
No, but if you use a galvanometer (as is usual) as a detector, it wouldn't move.
You would need an AC meter, which probably woudn't be as sensitive as a galvanometer.

A hot wire galvanometer would also work-- if you could find them.

In fact, instruments are made that are AC bridges. Select a frequency, amplitude and the spieces of impedence, inductance, ESR and so forth, that you want numbers for, and they display the effective values.
 

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