Saturday, November 13, 2010

Wheatstone Bridge

Wheatstone bridge is an electrical circuit invented by Samuel Hunter Christie in 1833 and improved and popularized by Sir Charles Wheatstone in 1843. [1] It is used to measure an unknown electrical resistance by balancing two legs of a bridge circuit, one leg of which includes the unknown component. Its operation is similar to the original potentiometer.

The desired value of Rx is now known to be given as:
R_x = {{R_3 \cdot R_2}\over{R_1}}

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