# Wheatstone bridge

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## Wheatstone bridge

A device used to measure the electrical resistance of an unknown resistor by comparing it with a known standard resistance. This method was first described by S. H. Christie in 1833. Since 1843 when Sir Charles Wheatstone called attention to Christie's work, Wheatstone's name has been associated with this network.

The Wheatstone bridge network consists of four resistors RAB, RBC, RCD, and RAD interconnected as shown in the illustration to form the bridge. A detector G, having an internal resistance RG, is connected between the B and D bridge points; and a power supply, having an open-circuit voltage E and internal resistance RB, is connected between the A and C bridge points. See Bridge circuit

Wheatstone bridge circuit

If the network is adjusted so that Eq. (1) is satisfied, the

(1)
detector current will be zero and this adjustment will be independent of the supply voltage, the supply resistance, and the detector resistance. Thus, when the bridge is balanced, Eq. (2)
(2)
holds, and, if it is assumed that the unknown resistance is the one in the CD arm of the bridge, then it is given by Eq. (3). (3)  See Resistance measurement

McGraw-Hill Concise Encyclopedia of Physics. © 2002 by The McGraw-Hill Companies, Inc.

## Wheatstone bridge

[′wēt‚stōn ′brij]
(electricity)
A four-arm bridge circuit, all arms of which are predominately resistive; used to measure the electrical resistance of an unknown resistor by comparing it with a known standard resistance. Also known as resistance bridge; Wheatstone network.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
A comparison of (25a) and (32) shows that the output voltage of the Wheatstone bridge is larger if each resistor has at least 1.4 squares.
Kreuzer, "Wheatstone bridge circuits shows almost no nonlinearity and sensitivity errors when used for single strain gage measurements", Technical literature of Hottinger Baldwin Messtechnik, [Online].
Output voltage was at remaining two copper pads as per Wheatstone bridge configuration.
The deformation is converted into the resistance variation in the gauges of the Wheatstone bridge on the other side.
The Model SDT transducer indicates the level of liquid by continuously measuring hydrostatic pressure via its sensing dement, an ion implanted silicon semiconductor sensor with integral Wheatstone Bridge circuit.
The first remotely controlled, automatic weighing system installed for rubber compounding took place around 1955, with the weighing equipment consisting of mechanical scale levers connected to dial indicators having potentiometer assemblies mounted on the dial spindles and simple Wheatstone Bridge circuitry activating electro mechanical relays for material feeding control.
Truthfully, students don't need to come to Virginia Tech, where I work, to learn Newton's Laws, find out what a Wheatstone bridge is, or how to design a PID controller.
Typically, a bolometer forms one or more legs of a Wheatstone bridge. Langley's device used thin strips of blackened platinum, one exposed to the solar radiation and one that was not.

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