Named after its inventor, this basic circuit allows resistors being measured very precisely by detecting a voltage difference between two voltage dividers. This voltage difference is zero if both dividers have the same ratio, so the unknown resistor can be calculated by simple arithmetics.
Because only the presence btw absence of a very small voltage difference must be measured (which can be done very precisely), the precision of the calculated values depends mostly on the precision of the known 3 resistors.

Here you may find Circuit, Basics, Schematic Diagram and components for Wheatstone Bridge

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