2024-12-21T18:00:00Z
Wheatstone Bridge
The Wheatstone Bridge is an electrical circuit used to measure an unknown resistance by balancing two legs of a bridge circuit. It was invented by Samuel Hunter Christie in 1833 and popularized by Sir Charles Wheatstone in 1843. The bridge consists of four resistors connected in a diamond-shaped configuration, with a voltage source applied across the circuit and a galvanometer to detect current flow.
Why Do We Use the Wheatstone Bridge?
- To Measure Unknown Resistance: It is primarily used to determine the value of an unknown resistance with high precision by comparing it to known resistances.
- High Accuracy: The bridge provides more accurate results than direct measurements with an ohmmeter because it eliminates errors caused by variations in voltage and current.
Wheatstone Bridge Formulas:
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R1 = (R2 × R3) / R4
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R2 = (R1 × R4) / R3
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R3 = (R1 × R4) / R2
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R4 = (R2 × R3) / R1
Rasistance Calculation:
Formula for R1:
R1 = (R2 × R3) / R4 = (20 × 30) / 40 = 15
Formula for R2:
R2 = (R1 × R4) / R3 = (15 × 40) / 30 = 20
Formula for R3:
R3 = (R1 × R4) / R2 = (15 × 40) / 20 = 30
Formula for R4:
R4 = (R2 × R3) / R1 = (20 × 30) / 15 = 40
I believe that it this topic will help you. Best of luck.
Yours Regards
Md. Anisur Rahman