The Wheatstone bridge was invented by Samuel Hunter Christie in 1833 and improved and popularized by Sir Charles Wheatstone in 1843. The instrument attached to the bridge circuit. Resistance value provides a baseline point for calibration of The value of R x can be calculatedfor the bridgeĭuring an ammeter zero current condition. The equation below shows the relationship of the resistance betweenĪnd R 3 are known values, the only unknownis R x. Resistance of both arms of the bridge circuit is the same. Is adjusted so that the ammeter reads zero current, the ![]() Analysis of the circuit shows that when R 2 Visually displays the current that is flowing through theīridge circuit. Is a variable resistor known as the standard arm that isĪdjusted to match the unknown resistor. Resistance'sfor current flow through the ammeter. Variable resistor R X (RTD), a source of voltage, The illustration below shows a basic bridgeĬircuit which consists of three known resistance's R 1, Wheatstone Bridge Analysis and Calculator. ![]() Wheatstone Bridge Circuit Equations and DerivationĮlectronics, Instrumentation & Electrical Database
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