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Wheatstone bridge
 Wheatstone bridgeThe equation to calculate the unknown resistance when the galvanometer reads 0 is Ru= ( R2/R1 ) Rv.Wheat·stone bridge W5115100 (wēt′stōn′, hwēt′-) also Wheat·stone's bridge (-stōnz′)n. An instrument or a circuit consisting of four resistors or their equivalent in series, used to determine the value of an unknown resistance when the other three resistances are known.
[After Sir Charles Wheatstone (1802-1875), British physicist and inventor.]Wheatstone bridge (ˈwiːtstən) n (General Physics) a device for determining the value of an unknown resistance by comparison with a known standard resistance[C19: named after Sir Charles Wheatstone (1802–75), British physicist and inventor]Wheat′stone bridge`
n. an electrical circuit that measures resistance comparatively. [1870–75; after C. Wheatstone] Thesaurus| Noun | 1. | Wheatstone bridge - a bridge used to measure resistancesbridge circuit, bridge - a circuit consisting of two branches (4 arms arranged in a diamond configuration) across which a meter is connected |
Wheatstone bridge
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 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. Wheatstone bridge
Wheat·stone bridge (wēt'stōn), an apparatus for measuring electrical resistance; four resistors are connected to form the four sides or "arms" of a square; a voltage is applied to one diagonal pair of connections, while the voltage between the other diagonal pair is measured, for example, by a galvanometer; the bridge is "balanced" when the measured voltage is zero; then, the ratios of the two pairs of adjoining resistances must be identical.Wheat·stone bridge (wēt'stōn brij) An apparatus for measuring electrical resistance; four resistors are connected to form the four sides or "arms" of a square; a voltage is applied to one diagonal pair of connections, while the voltage between the other diagonal pair is measured, e.g., by a galvanometer; the bridge is "balanced" when the measured voltage is zero; then, the ratios of the two pairs of adjoining resistances must be identical. Wheatstone bridge (hwēt′stōn″) [Sir Charles Wheatstone, Brit. scientist and inventor, 1802–1875] An electric circuit with two branches, each containing two resistors. These branches are joined to complete the circuit. If the resistance in three resistors is known, the resistance of the fourth, unknown, one can be calculated. Wheatstone, Charles, English physicist, 1802-1875. Wheatstone bridge - an apparatus for measuring electrical resistance.Wheatstone bridge
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