null-current circuit

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null-current circuit [′nəl ¦kə·rənt ′sər·kət]

(electronics)

A circuit used to measure current, in which the unknown current is opposed by a current resulting from applying a voltage controlled by a slide wire across a series resistor, and the slide wire is continuously adjusted so that the resulting current, as measured by a direct-current detector amplifier, is equal to zero.

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