Wheatstone Bridge: AC Source Effects on Balancing Condition

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SUMMARY

The balancing condition in a Wheatstone bridge does not change when using an AC source instead of a battery. However, a galvanometer, typically used as a detector, will not indicate movement under AC conditions. An AC meter is required for accurate measurements, though it may lack the sensitivity of a galvanometer. Specialized instruments known as AC bridges are available, which can measure impedance, inductance, and equivalent series resistance (ESR) at selected frequencies and amplitudes.

PREREQUISITES
  • Understanding of Wheatstone bridge configurations
  • Knowledge of AC circuit theory
  • Familiarity with galvanometers and their operation
  • Basic concepts of impedance and inductance
NEXT STEPS
  • Research the operation and applications of AC bridges
  • Learn about the differences between galvanometers and AC meters
  • Explore the principles of impedance measurement in AC circuits
  • Investigate the use of hot wire galvanometers in AC applications
USEFUL FOR

Electrical engineers, physics students, and anyone involved in circuit design or analysis, particularly those working with AC measurements and Wheatstone bridge applications.

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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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