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Wheatstone Bridge Circuit with labeled detail shows a balanced four-resistor network used for precise unknown resistance measurement. Current flows through two parallel arms: R1 and R2 on the left, R3 and R4 (Rx) on the right, with a galvanometer G detecting voltage difference between nodes C and D. At balance condition, the galvanometer reads zero current when R1/R2 = R3/R4, allowing calculation of unknown resistor Rx = R3 × (R2/R1). This circuit demonstrates a fundamental principle in analog electronics for accurate resistance measurement without requiring precision in the supply voltage. Fork this diagram to customize component values, add measurement tolerances, or adapt for AC bridge applications in your design documentation.

People also ask

How does a Wheatstone Bridge circuit measure unknown resistance and what is the balance condition equation?

A Wheatstone Bridge uses four resistors arranged in two parallel arms with a galvanometer detecting voltage between the bridge midpoints. At balance, when the galvanometer reads zero current, the unknown resistor Rx equals R3 × (R2/R1), making it a precise measurement tool independent of supply voltage stability.