Calculate unknown resistances, analyze bridge balance conditions, and design precision measurement circuits using Wheatstone bridge principles.
Enter values and click Calculate to see Wheatstone bridge analysis results
A Wheatstone bridge is balanced when no current flows through the galvanometer.
Strain gauges change resistance proportionally to applied strain.
Enter three known resistances (R1, R2, R3) and the supply voltage. Click Calculate to find the unknown resistance (Rx) and galvanometer current at balance condition.
R1=100Ω, R2=200Ω, R3=150Ω. Unknown Rx = (200 × 150) ÷ 100 = 300 Ω. The bridge is balanced when all ratios are equal.
A: A Wheatstone Bridge is a circuit used to measure an unknown resistance precisely by balancing two legs of a bridge circuit.
A: The bridge is balanced when R1/R2 = R3/Rx, meaning no current flows through the galvanometer. This gives Rx = R2×R3/R1.
A: A galvanometer is a sensitive current detector. In a Wheatstone bridge, it indicates when the bridge is balanced (zero current).
A: Strain gauges, temperature sensors (RTD), pressure sensors, and load cells all use Wheatstone bridge circuits.