Engineering Theory & Mathematical Model
Invented by Samuel Hunter Christie and popularized by Charles Wheatstone, the bridge compares an unknown resistance Rx (such as a strain gauge, RTD platinum thermometer, or thermistor) against three precision reference resistors. At exact balance (R1/R2 = R3/Rx), the center voltmeter reads strictly 0.00 V regardless of supply voltage fluctuations, enabling sub-milliohm resolution.
Interactive Lab Procedure
- Verify that at the initial 50% wiper setting (Rx = 500 Ω), the center bridge voltmeter reads 0.00 V.
- Click "Rx Sensor" (POT1) and drag the Wiper Position slider in the Inspector to simulate strain or temperature shifts.
- Watch V_bridge swing positive and negative linearly around the null point.
Technical FAQ
What is the core governing formula for Wheatstone Bridge Differential Sensor Simulator?
V_bridge = Vs × [ Rx / (R3 + Rx) − R2 / (R1 + R2) ] — Invented by Samuel Hunter Christie and popularized by Charles Wheatstone, the bridge compares an unknown resistance Rx (such as a strain gauge, RTD platinum thermometer, or thermistor) against three precision reference resistors. At exact balance (R1/R2 = R3/Rx), the center voltmeter reads strictly 0.00 V regardless of supply voltage fluctuations, enabling sub-milliohm resolution.
Can I modify component values and rewire this circuit live?
Yes! The schematic above runs a live MNA SPICE engine. Click any part to adjust parameters, add or delete wires and components, and click Share URL to save your custom topology.