Kelvin bridge

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A Kelvin bridge, also called a Kelvin double bridge and in some countries a Thomson bridge, is a measuring instrument used to measure unknown electrical resistors below 1 ohm. It is specifically designed to measure resistors that are constructed as four terminal resistors. Historically Kelvin Bridges were used to measure shunt resistors for Ammeters and sub one ohm reference resistors in Metrology laboratories. In Scientific community the Kelvin Bridge paired with Null Detector was used to achieve highest precision and allow early detection of Superconductivity.