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The equation to calculate the unknown resistance when the galvanometer reads 0 is Ru
Wheat·stone bridge(wēt′stōn′, hwēt′-) also Wheat·stone's bridge (-stōnz′)
An instrument or a circuit consisting of four resistors or their equivalent in series, used to determine the value of an unknown resistance when the other three resistances are known.
[After Sir Charles Wheatstone (1802-1875), British physicist and inventor.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.