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Education tool for post office box exhibited at Tokyo Denki University. The post office box was a Wheatstone bridge–style testing device with pegs and spring arms to close electrical circuits and measure properties of the circuit under test.
A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuit, one leg of which includes the unknown component. The primary benefit of the circuit is its ability to provide extremely accurate measurements (in contrast with something like a simple voltage divider ). [ 1 ]
The best-known bridge circuit, the Wheatstone bridge, was invented by Samuel Hunter Christie and popularized by Charles Wheatstone, and is used for measuring resistance. It is constructed from four resistors, two of known values R 1 and R 3 (see diagram), one whose resistance is to be determined R x , and one which is variable and calibrated R 2 .
The two remaining arms are the nearly equal resistances P and Q, connected in the inner gaps of the bridge. A standard Wheatstone bridge for comparison. Points A, B, C and D in both circuit diagrams correspond. X and Y correspond to R 1 and R 2, P and Q correspond to R 3 and R X. Note that with the Carey Foster bridge, we are measuring R 1 ...
A Wien bridge oscillator is a type of electronic oscillator that generates sine waves. It can generate a large range of frequencies . The oscillator is based on a bridge circuit originally developed by Max Wien in 1891 for the measurement of impedances . [ 1 ]
However, the method went unrecognised until 1843, when Charles Wheatstone proposed it, in another paper [3] for the Royal Society, for measuring resistance in electrical circuits. Although Wheatstone presented it as Christie's invention, it is his name, rather than Christie's, that is now associated with the device.
The operation of the Kelvin bridge is very similar to the Wheatstone bridge, but uses two additional resistors. Resistors R 1 and R 2 are connected to the outside potential terminals of the four terminal known or standard resistor R s and the unknown resistor R x (identified as P 1 and P′ 1 in the diagram).
Wheatstone may refer to: Cape Wheatstone, in Antarctica; Charles Wheatstone (1802–1875), a British scientist and inventor, eponymous for Wheatstone bridge; Cooke and Wheatstone Telegraph; Wheatstone, New Zealand, a locality in the Canterbury region; Wheatstone Glacier, in Antarctica; Wheatstone LNG; Wheatstone bridge, a measuring instrument ...