WHEATSTONE BRIDGE WITH PENCIL JOCKEY

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50,000Ugx

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Overview
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Wheatstone Bridge:

The Wheatstone Bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuit. One of these legs includes the unknown component (the resistor we want to measure). Here are the key points about the Wheatstone Bridge:

Components:
- Rx: The fixed, yet unknown, resistance to be measured.
- R1, R2, and R3: Resistors of known resistance.
- R2: Adjustable resistor.
Balancing:
- Adjust R2 until the bridge is “balanced,” meaning no current flows through the galvanometer (Vg).
- At balance, the potential difference between the midpoints (B and D) is zero.
- The ratio of resistances in the known leg (R2 / R1) equals the ratio of resistances in the unknown leg (Rx / R3).
Precision:
- Detecting zero current with a galvanometer can be done with high precision.
- If R1, R2, and R3 are known precisely, we can measure Rx accurately.
Applications:
- Originally used for soil analysis and comparison.
- Used in strain gauge and resistance thermometer measurements.