⚖️ Wheatstone Bridge Calculator

Calculate unknown resistances, analyze bridge balance conditions, and design precision measurement circuits using Wheatstone bridge principles.

Calculation Type

Input Parameters

Wheatstone Bridge - Unknown Resistance
Rx = R2 × R3 / R1
Calculate unknown resistance when bridge is balanced
R1 ——— R2
| |
| G |
| |
Rx ——— R3
Bridge Circuit (G = Galvanometer)

Results & Analysis

Enter values and click Calculate to see Wheatstone bridge analysis results

Wheatstone Bridge Theory

Balance Condition

A Wheatstone bridge is balanced when no current flows through the galvanometer.

  • R1 × R3 = R2 × Rx (balance equation)
  • Galvanometer current = 0
  • High precision measurement
  • Independent of supply voltage

Strain Measurement

Strain gauges change resistance proportionally to applied strain.

  • ΔR/R = GF × ε (gauge equation)
  • Bridge output ∝ applied strain
  • Temperature compensation
  • High sensitivity measurement

Applications

  • Resistance Measurement: Precise unknown resistance
  • Strain Gauges: Force and pressure sensors
  • Temperature Sensors: RTD measurements
  • Load Cells: Weight measurement systems