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Wheatstone Bridge Presentation

The Wheatstone Bridge is an electrical circuit designed to measure unknown resistances using the principle of null deflection. It operates by balancing two legs of a circuit, with no current flowing through the galvanometer when balanced. Its applications include accurate resistance measurement, strain gauge sensors, and temperature sensing, though it has limitations such as sensitivity to temperature and unsuitability for high resistance values.

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45 views9 pages

Wheatstone Bridge Presentation

The Wheatstone Bridge is an electrical circuit designed to measure unknown resistances using the principle of null deflection. It operates by balancing two legs of a circuit, with no current flowing through the galvanometer when balanced. Its applications include accurate resistance measurement, strain gauge sensors, and temperature sensing, though it has limitations such as sensitivity to temperature and unsuitability for high resistance values.

Uploaded by

manushidpatel
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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WHEATSTONE BRIDGE

Presented by: [Your Name]


Class: [Your Class]
Subject: [Subject Name]

Page 1
Introduction

The Wheatstone Bridge is an electrical circuit used to measure unknown resistances.


It works on the principle of null deflection and provides accurate measurements in
laboratory and industrial applications.

Page 2
Principle & Equation

The Wheatstone Bridge works on the principle of balancing two legs of a bridge
circuit. When the bridge is balanced:

P/Q=R/S

Where P, Q, R, S are resistors. No current flows through the galvanometer in the


balanced condition.

Page 3
Circuit Diagram

This is the standard configuration of a Wheatstone Bridge circuit with four resistors
and a galvanometer connected between two points.

Page 4
Working: Balanced vs Unbalanced

- In a balanced bridge, the voltage between the middle points is zero, and no current
flows through the galvanometer.
- In an unbalanced bridge, there is a voltage difference, and current flows through the
galvanometer, indicating an imbalance.

Page 5
Applications

- Accurate resistance measurement


- Strain gauge sensors
- Temperature sensing (RTDs)
- Light detection using LDRs
- Industrial instrumentation

Page 6
Advantages & Limitations

Advantages:
- High precision
- Simple design

Limitations:
- Sensitive to temperature
- Not suitable for high resistance values

Page 7
Conclusion

The Wheatstone Bridge is a fundamental tool in electronics for measuring resistance


accurately. It is widely used in both academic and practical electrical engineering
applications.

Page 8
References

- NCERT Physics Textbook


- Electronics Tutorials Online
- Wikipedia - Wheatstone Bridge
- YouTube - Wheatstone Bridge Explained

Page 9

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