# Wheatstone bridge

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## 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.
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