“Wheatstone bridge”的概念、定义、翻译、参考文献-科学参考

Wheatstone bridge

Physics

An electrical circuit for measuring the value of a resistance. In the illustration, R₁ is a resistance of unknown value, R₂ is a fixed resistance of known value, and R₃ and R₄ are variable resistances with known values. When no current flows between A and B the bridge is said to be balanced, the galvanometer registers no deflection, and R₁/R₂=R₃/R₄. R₁ can therefore be calculated. The Wheatstone bridge is used in various forms. In the metre bridge, a wire 1 metre long of uniform resistance is attached to the top of a board alongside a metre rule. A sliding contact is run along the wire, which corresponds to R₃ and R₄, until the galvanometer registers zero. Most practical forms use one or more rotary rheostats to provide the variation. The device was popularized, though not invented, by Sir Charles Wheatstone.

Wheatstone bridge.

Electronics and Electrical Engineering

A four-arm bridge used for measuring resistance. Each arm contains a resistance (see diagram), with the unknown and reference resistances, R₁ and R₂, being connected at a point. At balance, when a null response is obtained from the indicating instrument,
$\frac{R_{1}}{R_{2}} = \frac{R_{3}}{R_{4}}$
The two arms R₃ and R₄ are known as the ratio arms and may take the form of a wire of uniform resistance, which is tapped by a sliding contact. R₃ and R₄ are proportional to the lengths of wire, l₁ and l₂, on each side of the contact, so that
$\frac{R_{1}}{R_{2}} = \frac{l_{1}}{l_{2}}$
Wheatstone bridge

单词	Wheatstone bridge
释义	Wheatstone bridge Physics An electrical circuit for measuring the value of a resistance. In the illustration, R₁ is a resistance of unknown value, R₂ is a fixed resistance of known value, and R₃ and R₄ are variable resistances with known values. When no current flows between A and B the bridge is said to be balanced, the galvanometer registers no deflection, and R₁/R₂=R₃/R₄. R₁ can therefore be calculated. The Wheatstone bridge is used in various forms. In the metre bridge, a wire 1 metre long of uniform resistance is attached to the top of a board alongside a metre rule. A sliding contact is run along the wire, which corresponds to R₃ and R₄, until the galvanometer registers zero. Most practical forms use one or more rotary rheostats to provide the variation. The device was popularized, though not invented, by Sir Charles Wheatstone. Wheatstone bridge. Electronics and Electrical Engineering A four-arm bridge used for measuring resistance. Each arm contains a resistance (see diagram), with the unknown and reference resistances, R₁ and R₂, being connected at a point. At balance, when a null response is obtained from the indicating instrument, $\frac{R_{1}}{R_{2}} = \frac{R_{3}}{R_{4}}$ The two arms R₃ and R₄ are known as the ratio arms and may take the form of a wire of uniform resistance, which is tapped by a sliding contact. R₃ and R₄ are proportional to the lengths of wire, l₁ and l₂, on each side of the contact, so that $\frac{R_{1}}{R_{2}} = \frac{l_{1}}{l_{2}}$ Wheatstone bridge
随便看	hertz(symbol: Hz) Hervyan Herzberg, Gerhard Herzberg, Gerhard (1904–99) Herzen, Alexander Ivanovich (1812–70) Herzl, Theodor (1860–1904) Herzlyia Science Center Hesiod (c.700) Hesperian hesperidium hessenbergite Hess, Germain Henri Hess, Harry Hammond Hess, Harry Hammond (1906–69) HESSI Hessian hessian matrix Hess, Rudolf (1894–1987) Hess, Victor Francis Hess, Victor Francis (1883–1964) Hess, Walter Rudolf Hess’s law HETE-2 Heterian hetero-