Wheatstone Bridge Calculator
Calculate null balance and unknown resistance in Wheatstone bridge circuits.
Frequently Asked Questions
What is a Wheatstone bridge?
Classic four-arm circuit for precision resistance measurement. At null balance, Rx = R3 × R2 / R1. Used in strain gauges, pressure sensors, temperature measurement.
What is null balance?
Condition where voltage between bridge midpoints = 0. Detector reads zero. Indicates Rx = R3 × R2 / R1. Null balance is more accurate than voltage measurement.
How do I solve for unknown resistance?
Adjust known resistor R2 until detector shows null. Then Rx = R3 × (R2/R1). Used in precision resistance measurement and fault finding.
What is bridge sensitivity?
Change in output voltage per unit change in unknown resistance. Higher sensitivity = better for detecting small changes.
What is bridge imbalance?
When Rx ≠ R3 × R2/R1, bridge output ≠ 0. Output voltage indicates degree of imbalance. Used in sensor readout.