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Wheatstone bridge

Pronunciation: wēt′stōn

Definition: 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, 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.

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.